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Fatima N, Bibi Z, Rehman A, Ara Abbas Bukhari D. Biotoxicity comparison of Bacillus thuringiensis to control vector borne diseases against mosquito fauna. Saudi J Biol Sci 2023; 30:103610. [PMID: 37008283 PMCID: PMC10060249 DOI: 10.1016/j.sjbs.2023.103610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/04/2023] [Accepted: 02/23/2023] [Indexed: 03/05/2023] Open
Abstract
The current study was designed to evaluate the biotoxicity of screened echo-friendly Bacillus thuringiensis strains from different areas of Pakistan. Out of 50 samples, 36% Bt. isolates were quarantined from soil containing cattle waste after morphological, biochemical, and molecular characterization. The toxicity bioassays with Bt. spores and protein diet proved that 11 Bt. isolates were utmost noxious to 3rd instar larvae of mosquitoes Aedes aegypti, Anopheles stephensi, and Culex pipiens. The entopathogenic activity of first 4 Bt. toxins against A. aegypti was highly lethal as compared to the other dipteran larvae. The toxicity (LC50) of spore diet of Bt. strains GCU-DAB-NF4 (442.730 ± 0.38 μg/ml), NF6 (460.845 ± 0.29 μg/ml), NF3 (470.129 ± 0.28 μg/ml), and NF7 (493.637 ± 0.70 μg/ml) was quite high against A. aegypti as compared to the C. pipiens after 24 h of incubation. The highest toxicity of total cell protein was shown by GCU-DAB-NF4 (LC50 = 84.10 ± 50 μg/ml), NF6 (95.122 ± 0.40 μg/ml), NF3 (100.715 ± 06 μg/ml), and NF5 (103.40 ± 07 μg/ml) against A. aegypti after 24 h. So, these strains a have great potential to be used as biological control especially against A. aegypti as compared to the C. pipiens.
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Pagendam D, Elfekih S, Nassar MS, Nelson S, Almalik AM, Tawfik EA, Al-Fageeh MB, Hoffmann AA. Spatio-Temporal Modelling Informing Wolbachia Replacement Releases in a Low Rainfall Climate. INSECTS 2022; 13:949. [PMID: 36292897 PMCID: PMC9604250 DOI: 10.3390/insects13100949] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/13/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Releases of Aedes aegypti carrying Wolbachia bacteria are known to suppress arbovirus transmission and reduce the incidence of vector-borne diseases. In planning for Wolbachia releases in the arid environment of Jeddah, Saudi Arabia, we collected entomological data with ovitraps across a 7-month period in four locations. Herein, we show that mosquito presence in basements does not differ from that of non-basement areas of buildings. In modelling mosquito presence across the study sites, we found the spatial structure to be statistically significant in one of the four sites, while a significant spatial structure was found for egg production data across three of the four sites. The length scales of the spatial covariance functions fitted to the egg production data ranged from 143 m to 574 m, indicating that high productivity regions can be extensive in size. Rank-correlation analyses indicated that mosquito presence tended to persist from the dry to wet season, but that egg production ranks at locations could reverse. The data suggest that, in Jeddah, the quality of the local environment for breeding can vary over time. The data support the feasibility of dry season releases but with release numbers needing to be flexible depending on local rates of invasion.
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Affiliation(s)
- Dan Pagendam
- CSIRO Data61, Dutton Park, Brisbane, QLD 4101, Australia
| | - Samia Elfekih
- CSIRO H&B, Australian Centre for Disease Preparedness (ACDP), Geelong, VIC 3052, Australia
- Pest and Environmental Adaptation Research Group, Bio21 Institute and the School of Biosciences, University of Melbourne, Parkville, VIC 3052, Australia
| | - Majed S. Nassar
- King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
| | - Samuel Nelson
- CSIRO Data61, Black Mountain, Canberra, ACT 2601, Australia
| | - Abdulaziz M. Almalik
- King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
| | - Essam A. Tawfik
- King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
| | - Mohamed B. Al-Fageeh
- King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
| | - Ary A. Hoffmann
- Pest and Environmental Adaptation Research Group, Bio21 Institute and the School of Biosciences, University of Melbourne, Parkville, VIC 3052, Australia
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Al-Nefaie H, Alsultan A, Abusaris R. Temporal and spatial patterns of dengue geographical distribution in Jeddah, Saudi Arabia. J Infect Public Health 2022; 15:1025-1035. [PMID: 36007387 DOI: 10.1016/j.jiph.2022.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 06/29/2022] [Accepted: 08/06/2022] [Indexed: 10/15/2022] Open
Abstract
INTRODUCTION Dengue fever disease is affected by many scoioeconomic and enviromental factors throughout endemic areas globally. These factors contribute to increase the incidence of endemic dengue endemic in Jeddah, Saudi Arabia. OBJECTIVES This study aimed to investigate the distribution and spatial patterns of dengue fever cases in Jeddah, and to determine if there is an association between dengue fever and the following environmental factors: temperature, humidity, land cover, climate, rainfall, epicenter of reproduction, and socioeconomic factors. METHODS A descriptive and analytical cross-sectional study was conducted in Jeddah in 2020. The study included all reported suspected and confirmed dengue cases. The sample size was 1458 cases. Data were obtained from the Dengue Active Surveillance System and the confirmed cases were geo-distributed in areas by QGIS. All significant variables were included in the logistic regression table. RESULTS The majority (61.9 %) were suspected cases and 38.1 % confirmed cases. The majority of the cases were male. The highest spatial distribution was in the middle of Jeddah and the lowest in the south. The highest temporal distribution for confirmed cases was in June, and for suspected cases in December. Age, gender, occupation, and area were all significantly associated with the dengue reported cases. Most all the enviromental factors were not statistically significant. CONCLUSION The study showed three clusters of dengue fever and infection concentrated in the middle and east of Jeddah. The lack of investigation in the environmental factors regarding the dengue distribution and its impact on the population area has to be taken seriously and dengue intervention programs should be implemented to reduce the endemic dengue in Jeddah.
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Affiliation(s)
- Hissah Al-Nefaie
- Epidemiologist, Department of Communicable Diseases Control, Public Health Authority, Riyadh, Saudi Arabia; Department of Epidemiology and Biostatistics, College of Public Health and Health Informatics, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Amirah Alsultan
- Public Health, Public Health Authority, Riyadh, Saudi Arabia
| | - Raghib Abusaris
- Department of Epidemiology and Biostatistics, College of Public Health and Health Informatics, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia; King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia.
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Ali EOM, Babalghith AO, Bahathig AOS, Dafalla OM, Al-Maghamsi IW, Mustafa NEAG, Al-Zahrani AAA, Al-Mahmoudi SMY, Abdel-Latif ME. Detection of Dengue Virus From Aedes aegypti (Diptera, Culicidae) in Field-Caught Samples From Makkah Al-Mokarramah, Kingdom of Saudi Arabia, Using RT-PCR. Front Public Health 2022; 10:850851. [PMID: 35757606 PMCID: PMC9221504 DOI: 10.3389/fpubh.2022.850851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 04/08/2022] [Indexed: 11/13/2022] Open
Abstract
Dengue fever (DF) is endemic to Makkah and Jeddah, the Kingdom of Saudi Arabia (KSA). However, until recently, the circulation of dengue virus (DENV) in Aedes mosquitoes in these areas was unknown. Serological surveillance of DENV in Ae aegypti is a powerful tool for early detection of dengue outbreaks and essential for developing effective control strategies. Therefore, this research aimed to examine a sample of adult Ae aegypti mosquitoes from Makkah, KSA, to detect DENV. In total, 1295 Ae aegypti mosquitoes were collected from the field from target areas of Makkah with a high incidence and prevalence of DF. The samples were divided into 259 coded pools (five mosquitoes in each) and preserved in 1.5 mL plastic tubes. The tubes were labeled, capped, and stored at-86°C until use. RT-PCR was used to detect DENV in the samples. All positive pools were confirmed by RT-PCR. The RT-PCR products were analyzed by gel electrophoresis (1.5% agarose in Tris-acetate EDTA buffer), stained with ethidium bromide, and visualized. DENV was isolated from six female Ae Aegypti collected from six pools (out of 259 pools). No other viruses were detected. Only five of the nine target localities had positive pools. Samples from the remaining four localities yielded negative results. Four DENV-positive mosquitoes were collected at the aquatic stages, and two were collected at the adult stage. These results show the circulation of DENV in adult mosquitoes and offspring, indicating vertical transmission of DENV. In conclusion, this study found that, in Makkah, DENV is circulating in dengue vectors with a high significance rate, suggesting the possibility of a dengue outbreak in the future; therefore, a sensitive surveillance system is vital to predict the outbreak and for early intervention and control.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Mohamed E Abdel-Latif
- Department of Neonatology, Centenary Hospital for Women and Children, Canberra Hospital, Canberra, ACT, Australia.,Department of Public Health, La Trobe University, Melbourne, VIC, Australia.,Discipline of Neonatology, The Medical School, College of Health and Medicine, Australian National University, Acton, ACT, Australia
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Dorzaban H, Soltani A, Alipour H, Hatami J, Jaberhashemi SA, Shahriari-Namadi M, Paksa A, Safari R, Talbalaghi A, Azizi K. Mosquito surveillance and the first record of morphological and molecular-based identification of invasive species Aedes (Stegomyia) aegypti (Diptera: Culicidae), southern Iran. Exp Parasitol 2022; 236-237:108235. [PMID: 35247382 DOI: 10.1016/j.exppara.2022.108235] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 02/24/2022] [Accepted: 03/01/2022] [Indexed: 11/04/2022]
Abstract
Ae. aegypti is an important vector for transmission of some dangerous arboviral diseases, including Dengue Fever. The present study was conducted (from August 2017 to January 2020) to survey the fauna of Culicine mosquitoes, emphasizing the existence of this invasive species in oriental parts of the country located near the Persian Gulf. Different sampling methods were used to collect all life stages of the mosquito. After morphological identification, a molecular study based on Cytochrome Oxidase (COI) gene-specific primers was performed. Then, the COI gene was sequenced via the Sanger method. A total of 4843 adults and 11,873 larvae were collected (8 species of Culex, one species of Culiseta, and 5 species of Aedes). Fifty-five Ae. aegypti specimens (8 adults and 47 larvae) were identified.Based on the biology and ecological requirements of Ae. aegypti, the possibility of the permanent establishment of this species in the tropical climate of the region is very likely. Considering the detection of this invasive vector mosquito species in Iran and the high incidence of some arboviral diseases in the neighboring countries, and continuous movements of the settlers of these areas, potential outbreaks of arboviral diseases can be predicted. Planning and implementing an immediate surveillance and control program of the vector mosquito is vital to prevent the permanent establishment of this invasive vector mosquito species in southern Iran.
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Affiliation(s)
- Hedayat Dorzaban
- Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Aboozar Soltani
- Research Center for Health Sciences, Institute of Health, Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hamzeh Alipour
- Research Center for Health Sciences, Institute of Health, Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Jafar Hatami
- Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Aghil Jaberhashemi
- Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Marziae Shahriari-Namadi
- Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Azim Paksa
- Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Reza Safari
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | | | - Kourosh Azizi
- Research Center for Health Sciences, Institute of Health, Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
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Ahmed AM, El-Kersh TA, Hussein HI, Ayaad TH, El-Sadawy HA, Ibrahim MS, Amoudi MA, Aseery GM. Larvicidal activities of local Bacillus thuringiensis isolates and toxins from nematode bacterial symbionts against the Rift Valley fever vector, Aedes caspius (Diptera: Culicidae). AFRICAN ZOOLOGY 2021. [DOI: 10.1080/15627020.2020.1858720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Ashraf M Ahmed
- Department of Zoology, King Saud University, Riyadh, Saudi Arabia
- Department of Zoology, Minia University, El-Minia, Egypt
| | - Talat A El-Kersh
- Department of Clinical Laboratory Sciences, King Saud University, Riyadh, Saudi Arabia
- Department of Microbiology and Immunology, Badr University in Cairo (BUC), Badr-city, Cairo, Egypt
| | - Hamdy I Hussein
- Department of Plant Protection, King Saud University, Riyadh, Saudi Arabia
| | - Tahany H Ayaad
- Department of Zoology, King Saud University, Riyadh, Saudi Arabia
- Department of Entomology, Cairo University, Giza, Egypt
| | - Hanan A El-Sadawy
- Parasitology and Animal Diseases Department, National Research Centre, Dokki, Giza, Egypt
| | - Mohamed S Ibrahim
- Department of Clinical Laboratory Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Mikky A Amoudi
- Department of Zoology, King Saud University, Riyadh, Saudi Arabia
| | - Ghaleb M Aseery
- Department of Zoology, King Saud University, Riyadh, Saudi Arabia
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Alahmadi S, Ibrahim R, Messali M, Ali M. Effect of aminopyridinium-based ionic liquids against larvae of Culex pipiens (Diptera: Culicidae). JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE 2020. [DOI: 10.1080/16583655.2020.1782601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Saeed Alahmadi
- Department of Biology, College of Science, Taibah University, Al-Madinah Al-Munawwarah, Saudi Arabia
| | - Reda Ibrahim
- Department of Biology, College of Science, Taibah University, Al-Madinah Al-Munawwarah, Saudi Arabia
- Department of Economic Entomology, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Mouslim Messali
- Department of Chemistry, College of Science, Taibah University, Al-Madinah Al-Munawwarah, Saudi Arabia
| | - Medhat Ali
- Department of Biology, College of Science, Taibah University, Al-Madinah Al-Munawwarah, Saudi Arabia
- Department of Zoology, Faculty of Science, Ain Shams University, Cairo, Egypt
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Venkatesan M, Arumugam V, Pugalendi R, Ramachandran K, Sengodan K, Vijayan SR, Sundaresan U, Ramachandran S, Pugazhendhi A. Antioxidant, anticoagulant and mosquitocidal properties of water soluble polysaccharides (WSPs) from Indian seaweeds. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.05.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Ajlan BA, Alafif MM, Alawi MM, Akbar NA, Aldigs EK, Madani TA. Assessment of the new World Health Organization's dengue classification for predicting severity of illness and level of healthcare required. PLoS Negl Trop Dis 2019; 13:e0007144. [PMID: 31430283 PMCID: PMC6716674 DOI: 10.1371/journal.pntd.0007144] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 08/30/2019] [Accepted: 06/26/2019] [Indexed: 01/22/2023] Open
Abstract
The objective of this study was to assess the validity of the new dengue classification proposed by the World Health Organization (WHO) in 2009 and to develop pragmatic guidelines for case triage and management. This retrospective study involved 357 laboratory-confirmed cases of dengue infection diagnosed at King Abdulaziz University Hospital, Jeddah, Saudi Arabia over a 4-year period from 2014 to 2017. The sensitivity of the new classification for identifying severe cases was limited (65%) but higher than the old one (30%). It had a higher sensitivity for identifying patients who needed advanced healthcare compared to the old one (72% versus 32%, respectively). We propose adding decompensation of chronic diseases and thrombocytopenia-related bleeding to the category of severe dengue in the new classification. This modification improves sensitivity from 72% to 98% for identifying patients who need advanced healthcare without altering specificity (97%). It also improves sensitivity in predicting severe outcomes from 32% to 88%. In conclusion, the new classification had a low sensitivity for identifying patients needing advanced care and for predicting morbidity and mortality. We propose to include decompensation of chronic diseases and thrombocytopenia-related bleeding to the category of severe dengue in the new classification to improve the sensitivity of predicting cases requiring advanced care. Dengue fever, the most prevalent arthropod-borne viral disease in humans, has been conventionally classified into four main categories: non-classical, classical, dengue hemorrhagic fever, and dengue shock syndrome. Several studies reported lack of correlation between the categories of the conventional classification and the disease severity. As a consequence, the World Health Organization proposed in 2008 a new classification that divides dengue into two categories: non-severe and severe dengue; the non-severe dengue is further divided into two categories: dengue with warning signs and dengue without warning signs. In this retrospective study we reviewed 357 cases of dengue diagnosed in our institution over a 4-year period to assess the validity of the new dengue classification in order to develop pragmatic guidelines for case triage and management in the Emergency Departments. We found that the sensitivity of the new classification for identifying severe cases was limited even though it had a higher sensitivity for identifying patients who needed advanced healthcare compared to the old one. We propose adding decompensation of chronic diseases and low platelets-related bleeding to the category of severe dengue in the new classification. This modification dramatically improves the sensitivity for identifying patients who need advanced healthcare and the sensitivity to predict severe outcomes.
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Affiliation(s)
- Balgees A. Ajlan
- Department of Medicine, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Maram M. Alafif
- Department of Medicine, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Maha M. Alawi
- Department of Microbiology and Parasitology, King Abdulaziz University, Jeddah, Saudi Arabia
- Infection Control and Environmental Health Unit, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
| | - Naeema A. Akbar
- Department of Epidemiology and Public Health, Ministry of Health, Jeddah, Saudi Arabia
| | - Eman K. Aldigs
- Department of Microbiology and Parasitology, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Tariq A. Madani
- Department of Medicine, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
- Infection Control and Environmental Health Unit, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
- * E-mail:
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Ibrahim HA, Sawires S, Hamza A. Morphological characterization and distribution of antennal sensilla of irradiated female mosquito, Culex pipiens (Diptera: Culicidae) with gamma radiation. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2019. [DOI: 10.1016/j.jrras.2018.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Hatem A.M. Ibrahim
- Entomoloy Department, Faculty of Science, Ain Shams Univeristy, Cairo, Egypt
| | - S.G. Sawires
- Department of Natural Products, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority (AEA), Cairo, Egypt
| | - A.F. Hamza
- Department of Natural Products, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority (AEA), Cairo, Egypt
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Altassan KK, Morin C, Shocket MS, Ebi K, Hess J. Dengue fever in Saudi Arabia: A review of environmental and population factors impacting emergence and spread. Travel Med Infect Dis 2019; 30:46-53. [PMID: 30978417 DOI: 10.1016/j.tmaid.2019.04.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 11/09/2018] [Accepted: 04/07/2019] [Indexed: 12/31/2022]
Abstract
Dengue fever (DF) is the most important mosquito-transmitted viral disease causing a large economic and disease burden in many parts of the world. Most DF research focuses on Latin America and Asia, where burdens are highest. There is a critical need for studies in other regions where DF is an important public health problem but less well-characterized and can differ, such as the Middle East. The first documented case of DF in Saudi Arabia occurred in 1993. After a decade of sporadic outbreaks, the disease was declared endemic in 2004 and this designation persists. Climate, sociodemographic factors, and increasing urbanization impact the spread of DF in Saudi Arabia, as in other areas. However, DF transmission in Saudi Arabia is also affected by several unique factors, including large numbers of migrant workers and religious pilgrims from other dengue endemic areas across the Middle East, North Africa, and Asia. Important knowledge gaps relate to the role of climatic factors as drivers of DF in Saudi Arabia and the role of foreign workers and pilgrims in the original and continuous importation of dengue virus. Filling these gaps would improve health system preparedness.
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Affiliation(s)
- Kholood K Altassan
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195, USA.
| | - Cory Morin
- Department of Global Health, Schools of Medicine and Public Health, University of Washington, Seattle, WA, 98105, USA.
| | - Marta S Shocket
- Department of Biology, Stanford University, 371 Serra Mall Stanford, CA, 94305, USA.
| | - Kris Ebi
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195, USA; Department of Global Health, Schools of Medicine and Public Health, University of Washington, Seattle, WA, 98105, USA.
| | - Jeremy Hess
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195, USA; Department of Global Health, Schools of Medicine and Public Health, University of Washington, Seattle, WA, 98105, USA; Department of Environmental and Occupational Health Sciences, University of Washington, Box 357234 1959 NE Pacific Street, Seattle, WA, 98195, USA; Department of Emergency Medicine, School of Medicine, University of Washington, Seattle, WA, 98195, USA.
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Al-Tayib OA. An Overview of the Most Significant Zoonotic Viral Pathogens Transmitted from Animal to Human in Saudi Arabia. Pathogens 2019; 8:E25. [PMID: 30813309 PMCID: PMC6471281 DOI: 10.3390/pathogens8010025] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 02/01/2023] Open
Abstract
Currently, there has been an increasing socioeconomic impact of zoonotic pathogens transmitted from animals to humans worldwide. Recently, in the Arabian Peninsula, including in Saudi Arabia, epidemiological data indicated an actual increase in the number of emerging and/or reemerging cases of several viral zoonotic diseases. Data presented in this review are very relevant because Saudi Arabia is considered the largest country in the Peninsula. We believe that zoonotic pathogens in Saudi Arabia remain an important public health problem; however, more than 10 million Muslim pilgrims from around 184 Islamic countries arrive yearly at Makkah for the Hajj season and/or for the Umrah. Therefore, for health reasons, several countries recommend vaccinations for various zoonotic diseases among preventive protocols that should be complied with before traveling to Saudi Arabia. However, there is a shortage of epidemiological data focusing on the emerging and reemerging of zoonotic pathogens transmitted from animal to humans in different densely populated cities and/or localities in Saudi Arabia. Therefore, further efforts might be needed to control the increasing impacts of zoonotic viral disease. Also, there is a need for a high collaboration to enhance the detection and determination of the prevalence, diagnosis, control, and prevention as well as intervention and reduction in outbreaks of these diseases in Saudi Arabia, particularly those from other countries. Persons in the health field including physicians and veterinarians, pet owners, pet store owners, exporters, border guards, and people involved in businesses related to animal products have adopted various preventive strategies. Some of these measures might pave the way to highly successful prevention and control results on the different transmission routes of these viral zoonotic diseases from or to Saudi Arabia. Moreover, the prevention of these viral pathogens depends on socioeconomic impacts, available data, improved diagnosis, and highly effective therapeutics or prophylaxis.
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Affiliation(s)
- Omar A Al-Tayib
- Abdullah Bagshan for Dental and Oral Rehabilitation (DOR), Dental College Research Center, King Saud University, Riyadh 12372, Saudi Arabia.
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Khartoum, Khartoum 11111, Sudan.
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13
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Humphrey JM, Al-Absi ES, Hamdan MM, Okasha SS, Al-Trmanini DM, El-Dous HG, Dargham SR, Schieffelin J, Abu-Raddad LJ, Nasrallah GK. Dengue and chikungunya seroprevalence among Qatari nationals and immigrants residing in Qatar. PLoS One 2019; 14:e0211574. [PMID: 30703150 PMCID: PMC6355019 DOI: 10.1371/journal.pone.0211574] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 11/12/2018] [Indexed: 12/12/2022] Open
Abstract
The objective of this study is to characterize the seroprevalence of anti-dengue (DENV) and anti-chikungunya (CHIKV) antibodies among blood donors residing in Qatar who are Middle East and North Africa (MENA) nationals and non-nationals. Sera were collected from adult blood donors in Qatar from 2013 to 2016 and tested for anti-DENV and anti-CHIKV IgG using commercial microplate enzyme-linked immunosorbent assays. Age-specific seroprevalence was summarized by region/nationality: Asia (India, Philippines), Middle East (Iran, Jordan, Lebanon, Pakistan, Palestine, Syria, Yemen), North Africa (Egypt, Sudan), Qatar. The adjusted odds of anti-DENV and anti-CHIKV IgG seropositivity was estimated by logistic regression. Among 1,992 serum samples tested, Asian nationals had higher adjusted odds of being seropositive for anti-DENV antibodies compared to nationals of the Middle East (aOR 0.05, 95% CI 0.04-0.07), North Africa (aOR 0.14, 95% CI 0.10-0.20), and Qatar (aOR 0.01, 95% CI 0.01-0.03). Asian nationals also had higher adjusted odds of being seropositive for anti-CHIKV antibodies compared to those from the Middle East (aOR 0.14, 95% CI 0.07-0.27), North Africa (aOR 0.50, 95% CI 0.26-0.96), and Qatar (aOR 0.38, 95% CI 0.15-0.96). The adjusted odds of being anti-DENV seropositive was higher among anti-CHIKV seropositive adults, and vice versa (aOR 1.94, 95% CI 1.09-3.44), suggesting co-circulation of these viruses. DENV and CHIKV exposure is lower in Qatar and MENA nationals compared to Asian nationals suggesting a lower burden of DENV and CHIKV disease in the MENA. Antibodies to both viruses were detected in nationals from most MENA countries, supporting the need to better understand the regional epidemiology of these viruses.
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Affiliation(s)
- John M. Humphrey
- Division of Infectious Diseases, Department of Medicine, Indiana University, Indianapolis, IN, United States of America
- * E-mail: (GKN); (JMH)
| | - Enas S. Al-Absi
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
| | - Munia M. Hamdan
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
| | - Sara S. Okasha
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
| | - Diyna M. Al-Trmanini
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
| | - Hend G. El-Dous
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
| | - Soha R. Dargham
- Infectious Disease Epidemiology Group, Weill Cornell Medicine‐Qatar, Cornell University, Qatar Foundation—Education City, Doha, Qatar
| | - John Schieffelin
- Section of Infectious Diseases, Department of Pediatrics, Tulane University School of Medicine, New Orleans, LA, United States of America
| | - Laith J. Abu-Raddad
- Infectious Disease Epidemiology Group, Weill Cornell Medicine‐Qatar, Cornell University, Qatar Foundation—Education City, Doha, Qatar
- Department of Healthcare Policy and Research, Weill Cornell Medicine, Cornell University, New York, NY, United States of America
| | - Gheyath K. Nasrallah
- Department of Biomedical Science, College of Health Sciences, Qatar University, Doha, Qatar
- BioMedical Research Center, Qatar University, Doha, Qatar
- * E-mail: (GKN); (JMH)
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14
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Al-Raddadi R, Alwafi O, Shabouni O, Akbar N, Alkhalawi M, Ibrahim A, Hussain R, Alzahrani M, Al Helal M, Assiri A. Seroprevalence of dengue fever and the associated sociodemographic, clinical, and environmental factors in Makkah, Madinah, Jeddah, and Jizan, Kingdom of Saudi Arabia. Acta Trop 2019; 189:54-64. [PMID: 30244133 DOI: 10.1016/j.actatropica.2018.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 09/14/2018] [Accepted: 09/16/2018] [Indexed: 01/23/2023]
Abstract
This study aimed to estimate the seroprevalence of anti-dengue IgG antibodies in Makkah, Al Madinah, Jeddah, and Jizan; and to identify the associated demographic, clinical, and environmental independent risk factors. A community-based household serosurvey conducted between September 20, 2016 and January 31, 2017. A multi-stage stratified cluster sampling was used to select 6596 participants from Makkah, Madinah, Jeddah, and Jizan. Blood samples were drawn from all participants to detect anti-dengue IgG antibodies. A semi-structured questionnaire was used to collect information on demographic, clinical, and environmental data. Multivariate logistic regression was carried out to identify independent risk factors of dengue seropositivity. The dengue seroprevalence (95% confidence intervalI) was 26.7% (25.6%, 27.8%), with the highest (33.6%) and lowest (14.8%) rates in Jizan and Madinah, respectively, and reaching 50% or more in several districts of the four cities. Demographic predictors of seroprevalence included: dwelling in Makkah (odds ratio [OR] = 2.19, p < 0.001) or Jizan (OR = 2.17, p < 0.001); older age (OR = 3.91, p < 0.001 for age>30 years); housing type (OR = 1.84 and 1.82, p < 0.001 for popular and social houses, respectively); and number of household occupants (OR = 0.86 and 0.71 for 6-10 [p = 0.042] and 11-20 [p = 0.002] occupants, respectively). Environmental predictors included the absence of pest control works in residency area (OR = 1.39, p = 0.002), presence of mosquitoes in the home (OR = 1.39, p = 0.001), and absence of awareness campaigns (OR = 1.97, p < 0.001). One in four inhabitants of the Western region of Saudi Arabia was seropositive for the dengue virus. Implementation of behavior-based educational programs is recommended, involving the population in the identification and eradication of vector sources and promoting appropriate behaviors that prevent the spread.
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Zhou D, Duan B, Xu Y, Ma L, Shen B, Sun Y, Zhu C. NYD-OP7/PLC regulatory signaling pathway regulates deltamethrin resistance in Culex pipiens pallens (Diptera: Culicidae). Parasit Vectors 2018; 11:419. [PMID: 30012184 PMCID: PMC6048805 DOI: 10.1186/s13071-018-3011-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 07/11/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Investigation of insecticide resistance mechanisms is considered a vital first step towards the creation of effective strategies to control resistant mosquitoes and manage mosquito-borne diseases. Our previous study revealed that NYD-OP7 may be associated with deltamethrin resistance in Culex pipiens pallen. However, the precise function of NYD-OP7 in deltamethrin resistance is still unclear. In this study, we investigated the role of NYD-OP7 in the molecular mechanisms underlying pyrethroid resistance. RESULTS Knockdown of NYD-OP7 not only increased the susceptibility of the mosquitoes to deltamethrin in vivo but also simultaneously repressed both expression and enzyme activity of its downstream effector molecule, phospholipase C (PLC) and expression of several insecticide resistance-related P450 genes. Knockdown of PLC also sensitized the mosquitoes to deltamethrin and reduced the expression of the P450 genes. CONCLUSIONS Our results revealed that NYD-OP7 and its downstream effector PLC contribute to deltamethrin resistance by regulating the expression of P450s in Cx. pipiens pallens.
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Affiliation(s)
- Dan Zhou
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
| | - Baiyun Duan
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
| | - Yang Xu
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
| | - Lei Ma
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
| | - Bo Shen
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
| | - Yan Sun
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China.
| | - Changliang Zhu
- Department of Pathogen Biology, Nanjing Medical University, Nanjing, China
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16
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Romano D, Stefanini C, Canale A, Benelli G. Artificial blood feeders for mosquito and ticks-Where from, where to? Acta Trop 2018; 183:43-56. [PMID: 29625092 DOI: 10.1016/j.actatropica.2018.04.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 03/12/2018] [Accepted: 04/01/2018] [Indexed: 12/25/2022]
Abstract
Mosquito and tick feeding activity represent a key threat for humans, livestock, pets and wildlife worldwide. Rearing these vectors in laboratory conditions is extremely important to investigate basic facets of their biology, vector competence, new control strategies, as well as mechanisms of pesticide resistance. However, the use of animals or humans to provide blood for hematophagous arthropod feeding poses a strict limit to these researches, due to the accidental transmission of diseases, ethical problems concerning animal welfare, as well as expensive and time-consuming animal rearing procedures. The use of devices to artificially feed arthropod vectors can importantly leverage progresses in parasitology and entomology. The aim of this review is to summarize current knowledge about artificial feeding of mosquitoes and ticks, focusing on key concepts and case studies about the design and fabrication of blood feeding devices. From a technical standpoint, the literature analyzed here showed little standardization of materials used for fabricating membrane interfaces, as well as in the strategy used to heat the "biomimetic host". In addition, a lack of uniform methods to design an architecture merging complex and realistic cues with an easy-to-assemble approach have been found. Some commercial products are available, but they are quite expensive, thus hard to reach for many laboratories, especially in developing countries. An important challenge for future research is represented by the introduction of automation and bioinspired engineered solutions in these devices, improving the effectiveness of blood-feeding systems by increasing their host-mimicking features. Automation can reduce labor costs and provide interesting solutions - in line with the 3R principle "reduce, replace and refine" - aimed to minimize the employ of experimental animals in research.
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Affiliation(s)
- Donato Romano
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, viale Rinaldo Piaggio 34, 56025 Pontedera, Pisa, Italy
| | - Cesare Stefanini
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, viale Rinaldo Piaggio 34, 56025 Pontedera, Pisa, Italy; Department of Biomedical Engineering and Robotics Institute, Khalifa University, PO Box 127788, Abu Dhabi, UAE
| | - Angelo Canale
- Department of Agriculture, Food and Environment, University of Pisa, via del Borghetto 80, 56124 Pisa, Italy
| | - Giovanni Benelli
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, viale Rinaldo Piaggio 34, 56025 Pontedera, Pisa, Italy; Department of Agriculture, Food and Environment, University of Pisa, via del Borghetto 80, 56124 Pisa, Italy.
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17
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Benelli G. Managing mosquitoes and ticks in a rapidly changing world - Facts and trends. Saudi J Biol Sci 2018; 26:921-929. [PMID: 31303820 PMCID: PMC6600734 DOI: 10.1016/j.sjbs.2018.06.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/06/2018] [Accepted: 06/26/2018] [Indexed: 02/08/2023] Open
Abstract
Vector-borne diseases transmitted by mosquitoes and ticks are on the rise. The effective and sustainable control of these arthropod vectors is a puzzling challenge for public health worldwide. In the present review, I attempted to provide a concise and updated overview of the current mosquito and tick research scenario. The wide array of control tools recently developed has been considered, with special reference to those approved by the World Health Organization Vector Control Advisory Group (WHO VCAG), as well as novel ones with an extremely promising potential to be exploited in vector control programs. Concerning mosquitoes, a major focus has been given on genetically modified vectors, eave tubes, attractive toxic sugar baits (ATSB) and biocontrol agents. Regarding ticks, the recent development of highly effective repellents and acaricides (including nanoformulated ones) as well as behavior-based control tools, has been highlighted. In the second part of the review, key research questions about biology and control of mosquitoes and ticks have been critically formulated. A timely research agenda outlining hot issues to be addressed in mosquito and tick research is provided. Overall, it is expected that the present review will contribute to boost research and applications on successful mosquito and tick control strategies, along with an improved knowledge of their biology and ecology.
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Affiliation(s)
- Giovanni Benelli
- Department of Agriculture, Food and Environment, University of Pisa, via del Borghetto 80, 56124 Pisa, Italy.,The BioRobotics Institute, Sant'Anna School of Advanced Studies, viale Rinaldo Piaggio 34, 56025, Pontedera, Pisa, Italy
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18
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Badreddine S, Al-Dhaheri F, Al-Dabbagh A, Al-Amoudi A, Al-Ammari M, Elatassi N, Abbas H, Magliah R, Malibari A, Almoallim H. Dengue fever. Clinical features of 567 consecutive patients admitted to a tertiary care center in Saudi Arabia. Saudi Med J 2018; 38:1025-1033. [PMID: 28917067 PMCID: PMC5694636 DOI: 10.15537/smj.2017.10.20965] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVES To delineate the clinical features and outcomes of dengue infection and to guide clinician of early diagnosis and identification of risks factors for dengue hemorrhagic fever. Methods: This study is a retrospective cross-sectional. Clinical records of 567 patients with a confirmed diagnosis of dengue infection, admitted to a single hospital in Jeddah, Saudi Arabia, between January 2010 and June 2014 were reviewed. Results: Dengue infection was most common in adult males. Sixty-eight percent of infections were in Saudi nationals. In addition to the diagnostic clinical features, leucopenia and thrombocytopenia were typical of dengue infection. Approximately 4.1% of adult patients and 7.1% of pediatric patients developed dengue hemorrhagic fever (DHF). Abdominal pain and vomiting were more common in patients developing DHF. Mean platelet count was lower in adult, but not pediatric patients developing DHF. Peak alanine aminotransferase (ALT) was higher in adult and pediatric patients developing DHF. Three patients died, 2 of them developed DHF. Ninety-eight percent of adult patients and 92% of pediatric patients made a full recovery. Conclusions: Dengue infection is common in Jeddah. Abdominal pain and vomiting, thrombocytopenia, and elevated ALT are typical of severe infection, which is more likely to be associated with significant morbidity and mortality.
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Affiliation(s)
- Samar Badreddine
- Department of Medicine, Dr. Soliman Fakeeh Hospital, Jeddah, Kingdom of Saudi Arabia. E-mail.
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19
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Dengue infection in patients with febrile illness and its relationship to climate factors: A case study in the city of Jeddah, Saudi Arabia, for the period 2010-2014. Acta Trop 2018; 181:105-111. [PMID: 29452109 DOI: 10.1016/j.actatropica.2018.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/12/2018] [Indexed: 11/21/2022]
Abstract
Dengue is an important global arboviral disease with expanding geographical range. It is a major public health concern in Western Saudi Arabia since its first detection in the city of Jeddah in 1994. In this retrospective study, we examined dengue incidence among febrile patients suspected for acute dengue infection at King Abdulaziz University Hospital, Jeddah from 2010 to 2014 and we tried to determine the effect of climate factors on dengue incidence in the city. Acute dengue incidence rates among clinically suspected patients showed annual variation with a range from 29.3% to 57%. Male gender and 11-30 years age range were found to be risk factors for dengue infection in Jeddah. While dengue infections can be detected throughout the year, most cases occurred between March and July with peaks in May and June. Seasonality of dengue was found to be significantly associated with the decrease in relative humidity and increase in temperature within the range of ∼25 °C to ∼33 °C but not extremely hot temperatures. Moreover, we found that rainfall during winter (November to February) has a significant lag effect on dengue infection among febrile patients in the city. Jeddah is the second largest city in Saudi Arabia and a major hub for pilgrims because of its close proximity to the holy sites in the Kingdom. The observed high rates of acute dengue infections clearly show the endemicity of dengue in Jeddah. The observed higher incidence rates at young age are expected to cause an increase in severe dengue cases in the future especially that multiple dengue serotypes are co-circulating in the city. Furthermore, the significant association between the different climate factors and dengue and their impact on the disease seasonality should help in the effort to implement effective control and management measures to reduce dengue burden in the Kingdom.
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20
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Lourenço J, Tennant W, Faria NR, Walker A, Gupta S, Recker M. Challenges in dengue research: A computational perspective. Evol Appl 2018; 11:516-533. [PMID: 29636803 PMCID: PMC5891037 DOI: 10.1111/eva.12554] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 09/08/2017] [Indexed: 01/12/2023] Open
Abstract
The dengue virus is now the most widespread arbovirus affecting human populations, causing significant economic and social impact in South America and South-East Asia. Increasing urbanization and globalization, coupled with insufficient resources for control, misguided policies or lack of political will, and expansion of its mosquito vectors are some of the reasons why interventions have so far failed to curb this major public health problem. Computational approaches have elucidated on dengue's population dynamics with the aim to provide not only a better understanding of the evolution and epidemiology of the virus but also robust intervention strategies. It is clear, however, that these have been insufficient to address key aspects of dengue's biology, many of which will play a crucial role for the success of future control programmes, including vaccination. Within a multiscale perspective on this biological system, with the aim of linking evolutionary, ecological and epidemiological thinking, as well as to expand on classic modelling assumptions, we here propose, discuss and exemplify a few major computational avenues-real-time computational analysis of genetic data, phylodynamic modelling frameworks, within-host model frameworks and GPU-accelerated computing. We argue that these emerging approaches should offer valuable research opportunities over the coming years, as previously applied and demonstrated in the context of other pathogens.
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Affiliation(s)
| | - Warren Tennant
- Centre for Mathematics and the EnvironmentUniversity of ExeterPenrynUK
| | | | | | | | - Mario Recker
- Centre for Mathematics and the EnvironmentUniversity of ExeterPenrynUK
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21
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22
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Al-Tawfiq JA, Memish ZA. Dengue Hemorrhagic Fever Virus in Saudi Arabia: A Review. Vector Borne Zoonotic Dis 2018; 18:75-81. [PMID: 29319426 DOI: 10.1089/vbz.2017.2209] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Dengue fever is a global disease with a spectrum of clinical manifestation ranging from mild febrile disease to a severe disease in the form of dengue hemorrhagic fever and dengue shock syndrome. Dengue virus is one viral hemorrhagic fever that exists in the Kingdom of Saudi Arabia in addition to Alkhurma (Alkhurma) Hemorrhagic Fever, Chikungunya virus, Crimean-Congo Hemorrhagic Fever, and Rift Valley Fever. The disease is limited to the Western and South-western regions of Saudi Arabia, where Aedes aegypti exists. The majority of the cases in Saudi Arabia had mild disease and is related to serotypes 1-3 but not 4. The prospect for Dengue virus control relies on vector control, health education, and possibly vaccine use. Despite extensive collaborative efforts between multiple governmental sectors, including Ministry of Health, Ministry of Municipalities and Rural Affairs, and Ministry of Water, dengue remains a major public health concern in the regions affected.
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Affiliation(s)
- Jaffar A Al-Tawfiq
- 1 Johns Hopkins Aramco Healthcare , Dhahran, Kingdom of Saudi Arabia.,2 Indiana University School of Medicine , Indianapolis, Indiana
| | - Ziad A Memish
- 3 Ministry of Health , Riyadh, Kingdom of Saudi Arabia.,4 Hubert Department of Global Health, Rollins School of Public Health, Emory University , Atlanta, Georgia
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23
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Al-Mekhlafi FA. Larvicidal, ovicidal activities and histopathological alterations induced by Carum copticum (Apiaceae) extract against Culex pipiens (Diptera: Culicidae). Saudi J Biol Sci 2018; 25:52-56. [PMID: 29379357 PMCID: PMC5775081 DOI: 10.1016/j.sjbs.2017.02.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/15/2017] [Accepted: 02/25/2017] [Indexed: 11/22/2022] Open
Abstract
An experiment was carried out, firstly, to determine the possible toxicity of Carum copticum (Apiaceae) extract against Culex pipiens (Diptera: Culicidae), and, secondly, to study the histopathological alterations in the midgut of Cx. pipiens as a result of treatment with C. copticum extract. Larvicidal and ovicidal activities of C. copticum extract against the larvae of Cx. pipiens was determined according to World health organization (WHO). The inhibition effect of C. copticum was assessed by determining the mortality of the treated larvae and eggs. The histopathological effect of the C. copticum extracts on midgut epithelium of the larvae was examined under both light and transmission electron microscopy. The crude extract of C. copticum exerted 100% mortality for Cx. pipiens after 24 h at 200 μm/ml, and zero hatchability (100% mortality) at 150 μm/ml for Cx. pipiens. The histopathological study showed that larvae treated with C. copticum extract had cytopathological alterations of the midgut epithelium. The study provided information on various effects of C. copticum extract against Cx. pipiens.
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24
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The prevalence of dengue virus serotypes in asymptomatic blood donors reveals the emergence of serotype 4 in Saudi Arabia. Virol J 2017; 14:107. [PMID: 28599678 PMCID: PMC5466713 DOI: 10.1186/s12985-017-0768-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/24/2017] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Transmission of dengue virus (DENV) through blood transfusion has been documented and hence screening for DENV during blood donation has been recently recommended by the American Association of Blood Banks and Centres of Disease Control and Prevention. DENV is endemic in the Western province of the Kingdom of Saudi Arabia (KSA) and serotypes 1, 2 and 3, but not 4, have been detected. However, little is known regarding the rates of DENV during blood donation in the kingdom. The aim of this study was therefore to measure the prevalence of dengue virus and its serotypes in eligible Saudi blood donors in the endemic Western region of KSA. METHODS This was a cross-sectional study and serum samples were collected from 910 eligible Saudi male blood donors. DENV IgM and IgG antibodies were measured serologically by ELISA while viral serotypes were detected by a single step IVD CE certified multiplex RT-PCR kit. RESULTS The overall prevalence was 39 and 5.5% for IgG+ and IgM+, respectively. There were 12 (1.3%) with exclusively IgM+, 317 (34.8%) exclusively IgG+ and 38 (4.2%) with dual IgM+/IgG+ donors. The overall prevalence was 3.2% (n = 29) and 2.3% (n = 21) for primary and secondary infections. PCR was positive in 5.5% (n = 50) and, DENV-2 (n = 24; 48%) was the most frequent serotype and was significantly higher than DENV-1 (20%; P = 0.02) and DENV-3 (2%; P = 0.1 × 10-5) but not DENV-4 (30%; P = 0.2). There was no significant difference between both DENV-4 and DENV-1 (P = 0.4). The combination of the PCR and serology findings showed that 22 (2.4%) and 28 (3.1%) donors had primary and secondary viremic infections, respectively. CONCLUSIONS The detected rates of DENV by PCR suggest a potential high risk of viral transmission by blood transfusion. To the best of our knowledge, this study is the first to report the detection of DENV-4 serotype in Saudi Arabia. More studies are required to measure the precise prevalence of DENV serotypes and their potential transmission rate during blood donation in the kingdom.
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25
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Ahmed AM, Hussein HI, El-Kersh TA, Al-Sheikh YA, Ayaad TH, El-Sadawy HA, Al-Mekhlafi FA, Ibrahim MS, Al-Tamimi J, Nasr FA. Larvicidal Activities of Indigenous Bacillus thuringiensis Isolates and Nematode Symbiotic Bacterial Toxins against the Mosquito Vector, Culex pipiens (Diptera: Culicidae). J Arthropod Borne Dis 2017; 11:260-277. [PMID: 29062851 PMCID: PMC5641615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Accepted: 07/09/2016] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND The incidence of mosquito-borne diseases and the resistance of mosquitoes to conventional pesticides have recently caused a panic to the authorities in the endemic countries. This study was conducted to identify native larvicidal biopesticides against Culex pipiens for utilization in the battle against mosquito-borne diseases. METHODS Larvicidal activities of new indigenous Bacillus thuringiensis isolates and crude toxin complexes (TCs) of two nematode bacterial-symbionts, Photorhabdus luminescens akhurstii (HRM1) and Ph. luminescens akhurstii (HS1) that tested against Cx. pipiens. B. thuringiensis isolates were recovered from different environmental samples in Saudi Arabia, and the entomopathogenic nematodes, Heterorhabditis indica (HRM1) and He. sp (HS1) were isolated from Egypt. Larvicidal activities (LC50 and LC95) of the potentially active B. thuringiensis strains or TCs were then evaluated at 24 and 48h post-treatment. RESULTS Three B. thuringiensis isolates were almost as active as the reference B. thuringiensis israelensis (Bti-H14), and seven isolates were 1.6-5.4 times more toxic than Bti-H14. On the other hand, the TCs of the bacterial symbionts, HRM1 and HS1, showed promising larvicidal activities. HS1 showed LC50 of 2.54 folds that of HRM1 at 24h post-treatment. Moreover, histopathological examinations of the HS1-treated larvae showed deformations in midgut epithelial cells at 24h post-treatment. CONCLUSION Synergistic activity and molecular characterization of these potentially active biocontrol agents are currently being investigated. These results may lead to the identification of eco-friend mosquito larvicidal product(s) that could contribute to the battle against mosquito-borne diseases.
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Affiliation(s)
- Ashraf M Ahmed
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
- Department of Zoology, College of Science, Minia University, El-Minia, Egypt
| | - Hamdy I Hussein
- Department of Plant Protection, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Talat A El-Kersh
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Yazeed A Al-Sheikh
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Tahany H Ayaad
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
- Department of Entomology, College of Science, Cairo University, Giza, Egypt
| | - Hanan A El-Sadawy
- Parasitology and Animal Diseases Department, Veterinary Division, National Research Centre, Dokki, Giza, Egypt
| | - Fahd A Al-Mekhlafi
- Bioproducts Research Chair, Department of Zoology, College of Science, King Saud University, Saudi Arabia
- Department of Agricultural Production, College of Agriculture and Veterinary Medicine, Thamar University, Dhamar, Yemen
| | - Mohamed S Ibrahim
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Jameel Al-Tamimi
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Fahd A Nasr
- Bioproducts Research Chair, Department of Zoology, College of Science, King Saud University, Saudi Arabia
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26
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Ashshi AM, Alghamdi S, El-Shemi AG, Almdani S, Refaat B, Mohamed AM, Ghazi HO, Azhar EI, Al-Allaf FA. Seroprevalence of Asymptomatic Dengue Virus Infection and Its Antibodies Among Healthy/Eligible Saudi Blood Donors: Findings From Holy Makkah City. Virology (Auckl) 2017; 8:1-5. [PMID: 28469422 PMCID: PMC5348084 DOI: 10.1177/1178122x17691261] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Accepted: 01/08/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Threat to blood transfusion-transmitted dengue virus (DENV) and its antibodies has recently emerged worldwide. Dengue fever is an endemic disease in Saudi Arabia, particularly in its Western region. The aim of this study was to estimate the seroprevalence of asymptomatic DENV infection and its antibodies among eligible Saudi blood donors. METHODS Serum samples from 910 healthy/eligible adult male Saudi blood donors, who reside in Holy Makkah City of Saudi Arabia, were collected between March 2015 and August 2016 and screened for the detection of DENV nonstructural protein 1 (NS1) antigen and anti-DENV IgM and IgG antibodies using commercial enzyme-linked immunosorbent assay kits (Panbio, Brisbane, QLD, Australia). RESULTS Among the tested donors, 48 (5.3%) were seropositive for DENV-NS1 antigen, whereas 50 (5.5%) and 354 (38.9%) were seropositive for anti-DENV IgM and IgG antibodies, respectively. Seropositivity for DENV-NS1 antigen and/or anti-DENV IgM antibody among the tested donors reflects their ongoing asymptomatic viremic infectious stage with DENV during their donation time, whereas high prevalence of anti-DENV IgG seropositivity reflects the high endemicity of dengue disease in this region of Saudi Arabia. CONCLUSIONS These results show high prevalence of asymptomatic DENV infection and its antibodies among Saudi blood donors, raising the importance of establishing blood screening for dengue disease at different blood donation services and units in Saudi Arabia to improve the guarantee of blood transfusions and to control DENV dissemination.
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Affiliation(s)
- Ahmed M Ashshi
- Department of Laboratory Medicine, Faculty of Applied Medical Sciences, Umm Al-Qura University, Holy Makkah, Saudi Arabia
| | - Saad Alghamdi
- Department of Laboratory Medicine, Faculty of Applied Medical Sciences, Umm Al-Qura University, Holy Makkah, Saudi Arabia
| | - Adel G El-Shemi
- Department of Laboratory Medicine, Faculty of Applied Medical Sciences, Umm Al-Qura University, Holy Makkah, Saudi Arabia.,Department of Pharmacology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Sabir Almdani
- Immunology Unit, Regional Laboratory of Holy Makkah, Holy Makkah, Saudi Arabia
| | - Bassem Refaat
- Department of Laboratory Medicine, Faculty of Applied Medical Sciences, Umm Al-Qura University, Holy Makkah, Saudi Arabia
| | - Amr M Mohamed
- Department of Laboratory Medicine, Faculty of Applied Medical Sciences, Umm Al-Qura University, Holy Makkah, Saudi Arabia.,Department of Animal Medicine, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
| | - Hani O Ghazi
- Department of Medical Microbiology, College of Medicine, Umm Al-Qura University, Holy Makkah, Saudi Arabia
| | - Esam I Azhar
- Medical Laboratory Technology Department, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Faisal A Al-Allaf
- Department of Human Genetics, College of Medicine, Umm Al-Qura University, Holy Makkah, Saudi Arabia
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WITHDRAWN: Overview of dengue virus infection in Saudi Arabia. Saudi J Biol Sci 2016. [DOI: 10.1016/j.sjbs.2016.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Mahyoub JA, Alsobhi AS, Al-Ghamdi K, Khatter NA, Aziz AT, Al-Shami SA, Panneerselvam C, Murugan K, Nicoletti M, Canale A, Benelli G. Effectiveness of seven mosquito larvicides against the West Nile vector Culex pipiens (L.) in Saudi Arabia. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2016. [DOI: 10.1016/s2222-1808(15)61048-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Jemal Y, Al-Thukair AA. Combining GIS application and climatic factors for mosquito control in Eastern Province, Saudi Arabia. Saudi J Biol Sci 2016; 25:1593-1602. [PMID: 30591775 PMCID: PMC6303144 DOI: 10.1016/j.sjbs.2016.04.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 03/22/2016] [Accepted: 04/04/2016] [Indexed: 12/04/2022] Open
Abstract
This study aims to determine the effect of climatic factors (temperature, relative humidity and rainfall) on mosquito abundance and to map mosquito larva breeding sites using GIS application in Eastern Province, Saudi Arabia. The data pertaining to larval and adult mosquito abundance/distribution and climatic factors were collected for the study period of 2014. Bi-variate and multivariate analyses were performed to determine the relationship between mosquito abundance and climatic factors (temperature, relative humidity and rainfall). The utilization of GIS with GPS facilitates to identify and map larva breeding sites in the study area. The result showed strong negative correlation between mosquito abundance and temperature while there appeared a strong positive correlation with relative humidity and moderate positive correlation with rainfall. Low mosquito abundance was observed at high temperatures whereas high and moderate mosquito abundance was observed at high humidity and during rainy months, respectively. In the adult mosquito, the regression model for three climatic factors (temperature, RH and rainfall) and other factors showed a variation of 84.5% of the variance accounted for the climatic factors while the remaining 15.5% were attributed to other factors. In larva, 64.3% of the variance accounted for climatic factors, and the remaining 35.7% attributed to other factors such as the presence of vegetation, waste materials and water reservoirs such as ditches. In comparison, the larva seems influenced by the presence of vegetation, waste material, water reservoirs and ditches and less influenced by climatic factors than the adult mosquito. Development of a risk map by considering the flying distance of the adult mosquito from the studied sites showed three major clusters where a recommendation for management control program was suggested.
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Affiliation(s)
- Yasin Jemal
- Earth Science Department, King Fahd University of Petroleum and Minerals (KFUPM), P.O. Box: 8110, Dhahran 31261, Saudi Arabia
| | - Assad A Al-Thukair
- Life Science Department, King Fahd University of Petroleum and Minerals (KFUPM), P.O. Box: 157, Dhahran 31261, Saudi Arabia
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Hotez PJ. Neglected Tropical Diseases in the Anthropocene: The Cases of Zika, Ebola, and Other Infections. PLoS Negl Trop Dis 2016; 10:e0004648. [PMID: 27058728 PMCID: PMC4825952 DOI: 10.1371/journal.pntd.0004648] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Peter J. Hotez
- Departments of Pediatrics and Molecular Virology and Microbiology, National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Sabin Vaccine Institute and Texas Children’s Hospital Center for Vaccine Development, Houston, Texas, United States of America
- James A. Baker III Institute for Public Policy, Rice University, Houston, Texas, United States of America
- Department of Biology, Baylor University, Waco, Texas, United States of America
- * E-mail:
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Jamjoom GA, Azhar EI, Kao MA, Radadi RM. Seroepidemiology of Asymptomatic Dengue Virus Infection in Jeddah, Saudi Arabia. Virology (Auckl) 2016; 7:1-7. [PMID: 26917954 PMCID: PMC4758801 DOI: 10.4137/vrt.s34187] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 01/10/2016] [Accepted: 01/22/2016] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Although virologically confirmed dengue fever has been recognized in Jeddah, Saudi Arabia, since 1994, causing yearly outbreaks, no proper seroepidemiologic studies on dengue virus have been conducted in this region. Such studies can define the extent of infection by this virus and estimate the proportion that may result in disease. The aim of this study was to measure the seroprevalence of past dengue virus infection in healthy Saudi nationals from different areas in the city of Jeddah and to investigate demographic and environmental factors that may increase exposure to infection. METHODS Sera were collected from 1984 Saudi subjects attending primary health care centers in six districts of Jeddah. These included general patients of various ages seeking routine vaccinations, antenatal care or treatment of different illnesses excluding fever or suspected dengue. A number of blood donors were also tested. Serum samples were tested by enzyme immunoassay (EIA) for IgG antibodies to dengue viruses 1, 2, 3, 4. A questionnaire was completed for each patient recording various anthropometric data and factors that may indicate possible risk of exposure to mosquito bites and dengue infection. Patients with missing data and those who reported a history of dengue fever were excluded from analysis, resulting in a sample of 1939 patients to be analyzed. RESULTS The overall prevalence of dengue virus infection as measured by anti-dengue IgG antibodies from asymptomatic residents in Jeddah was 47.8% (927/1939) and 37% (68/184) in blood donors. Infection mostly did not result in recognizable disease, as only 19 of 1956 subjects with complete information (0.1%) reported having dengue fever in the past. Anti dengue seropositivity increased with age and was higher in males than females and in residents of communal housing and multistory buildings than in villas. One of the six districts showed significant increase in exposure rate as compared to the others. Availability of public sewage was associated with lower infection at a nearly significant level. No other clear risk factors were identifiable. Infection was not related to travel abroad. CONCLUSIONS Our results indicate a relatively high exposure of Jeddah residents to infection by dengue viruses, which must be considered endemic to this region. Infection largely remained asymptomatic or was only associated with minor illness for which patients did not seek treatment. These results call for continued vigilance for clinical cases of dengue that may arise from this wide exposure. They also call for more extensive control efforts to reduce exposure to and transmission of dengue viruses.
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Affiliation(s)
- Ghazi A Jamjoom
- Medical Laboratory Technology Department, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.; Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Esam I Azhar
- Medical Laboratory Technology Department, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.; Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Moujahid A Kao
- Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
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Kardousha MM. First report of some adult mosquitoes captured by CDC gravid traps from North-Eastern Qatar. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2016. [DOI: 10.1016/s2222-1808(15)60993-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Additional records of vector mosquito diversity collected from Al Khor district of North-eastern Qatar. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2015. [DOI: 10.1016/s2222-1808(15)60944-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Aziz AT, Al-Shami SA, Mahyoub JA, Hatabbi M, Ahmad AH, Md Rawi CS. Promoting health education and public awareness about dengue and its mosquito vector in Saudi Arabia. Parasit Vectors 2014; 7:487. [PMID: 25403705 PMCID: PMC4241221 DOI: 10.1186/s13071-014-0487-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 10/09/2014] [Indexed: 11/10/2022] Open
Abstract
Currently, dengue fever is considered as the main health problem in several parts (Mekkah, Jeddah, Jazan and Najran) of Kingdom of Saudi Arabia (KSA) with dramatically increase in the number of cases reported every year. This is associated with obvious ineffectiveness in the recent control and management programs for the mosquito vector (Aedes aegypti). Here, we suggested promoting the health education and public awareness among Saudi people to improve the control of dengue mosquito vector. Several suggestions and recommendations were highlighted here to ensure effectiveness in the future control and management programs of dengue mosquito vector in KSA.
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Affiliation(s)
- Al Thabiani Aziz
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia.
| | - Salman A Al-Shami
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia.
| | - Jazem A Mahyoub
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P. O. Box, 80203, Jeddah, 21589, Saudi Arabia.
| | - Mesed Hatabbi
- Ministry of Health, Jeddah, Kingdom of Saudi Arabia.
| | - Abu Hassan Ahmad
- School of Biological Sciences, Universiti Sains Malaysia, Penang, 11800, Malaysia.
| | - Che Salmah Md Rawi
- School of Biological Sciences, Universiti Sains Malaysia, Penang, 11800, Malaysia.
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Christofferson RC, Mores CN, Wearing HJ. Characterizing the likelihood of dengue emergence and detection in naïve populations. Parasit Vectors 2014; 7:282. [PMID: 24957139 PMCID: PMC4082489 DOI: 10.1186/1756-3305-7-282] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 06/19/2014] [Indexed: 12/03/2022] Open
Abstract
Background Vector-borne disease transmission is dependent on the many nuances of the contact event between infectious and susceptible hosts. Virus acquisition from a viremic human to a susceptible mosquito is often assumed to be nearly perfect and almost always uniform across the infectious period. Dengue transmission models that have previously addressed variability in human to vector transmission dynamics do not account for the variation in infectiousness of a single individual, and subsequent infection of naïve mosquitoes. Understanding the contribution of this variability in human infectiousness is especially important in the context of introduction events where an infected individual carries the virus into a population of competent vectors. Furthermore, it could affect the ability to detect an epidemic (and the timing of detection) following introduction. Methods We constructed a stochastic, compartmental model to describe the heterogeneity of human viremia and calculate the probability of a successful introduction, taking into account the viremia level (and thus acquisition potential) of the index case on, and after, the day of introduction into a susceptible population and varying contact rates between the human and mosquito populations. We then compared the results of this model with those generated by a simpler model that has the same average infectiousness but only a single infectious class. Results We found that the infectivity of the index case as well as the contact rate affected the probability of emergence, but that contact rate had the most significant effect. We also found that the interaction between contact rate and the infectiousness of the index case affected the time to detection relative to the peak of the epidemic curve. Additionally, when compared to our model that accounts for variable infectiousness, a model with a single infectious class underestimates the probability of emergence and transmission intensity. Conclusion Understanding the interplay between individual human heterogeneity of infectiousness and the rate of contact with the vector population will be important when predicting the likelihood, detection, and magnitude of an outbreak.
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Affiliation(s)
- Rebecca C Christofferson
- Department of Pathobiological Sciences, Skip Bertman Drive, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
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