1
|
Ikuse T, Aizawa Y, Kachikawa R, Kamata K, Osada H, Win SMK, Di Ja L, Win NC, Thein KN, Thida A, Tun A, Ito A, Kyaw Y, Tin HH, Shobugawa Y, Watanabe H, Saito R, Saitoh A. Detection of enterovirus D68 among children with severe acute respiratory infection in Myanmar. J Microbiol Immunol Infect 2024; 57:238-245. [PMID: 38233293 DOI: 10.1016/j.jmii.2024.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 12/05/2023] [Accepted: 01/02/2024] [Indexed: 01/19/2024]
Abstract
BACKGROUND Enterovirus D68 (EV-D68) is an important reemerging pathogen that causes severe acute respiratory infection and acute flaccid paralysis, mainly in children. Since 2014, EV-D68 outbreaks have been reported in the United States, Europe, and east Asia; however, no outbreaks have been reported in southeast Asian countries, including Myanmar, during the previous 10 years. METHODS EV-D68 was detected in nasopharyngeal swabs from children with acute lower respiratory infections in Myanmar. The samples were previously collected from children aged 1 month to 12 years who had been admitted to the Yankin Children Hospital in Yangon, Myanmar, between May 2017 and January 2019. EV-D68 was detected with a newly developed EV-D68-specific real-time PCR assay. The clade was identified by using a phylogenetic tree created with the Bayesian Markov chain Monte Carlo method. RESULTS During the study period, nasopharyngeal samples were collected from 570 patients. EV-D68 was detected in 42 samples (7.4 %)-11 samples from 2017 to 31 samples from 2018. The phylogenetic tree revealed that all strains belonged to clade B3, which has been the dominant clade worldwide since 2014. We estimate that ancestors of currently circulating genotypes emerged during the period 1980-2004. CONCLUSIONS To our knowledge, this is the first report of EV-D68 detection in children with acute lower respiratory infections in Yangon, Myanmar, in 2017-2018. Detection and detailed virologic analyses of EV-D68 in southeast Asia is an important aspect of worldwide surveillance and will likely be useful in better understanding the worldwide epidemiologic profile of EV-D68 infection.
Collapse
Affiliation(s)
- Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Ryotaro Kachikawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Kazuhiro Kamata
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan; Infectious Diseases Research Center of Niigata University in Myanmar, 35, Maw Koon Tike St., Pyay (East) Ward, Dagon, Yangon, Myanmar
| | - Hidekazu Osada
- Infectious Diseases Research Center of Niigata University in Myanmar, 35, Maw Koon Tike St., Pyay (East) Ward, Dagon, Yangon, Myanmar
| | - Su Mon Kyaw Win
- Infectious Diseases Research Center of Niigata University in Myanmar, 35, Maw Koon Tike St., Pyay (East) Ward, Dagon, Yangon, Myanmar
| | - Lasham Di Ja
- Infectious Diseases Research Center of Niigata University in Myanmar, 35, Maw Koon Tike St., Pyay (East) Ward, Dagon, Yangon, Myanmar
| | - Nay Chi Win
- Infectious Diseases Research Center of Niigata University in Myanmar, 35, Maw Koon Tike St., Pyay (East) Ward, Dagon, Yangon, Myanmar
| | - Khin Nyo Thein
- Yankin Children Hospital, 90, Thitsar Rd., Kanbe, Yankin Township, Yangon, Myanmar
| | - Aye Thida
- University of Medicine 2, Khaymar Thi Rd, Yangon, Myanmar
| | - Aye Tun
- Ministry of Health, Office No.4, Nay Pyi Taw, Myanmar
| | - Ai Ito
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Yadanar Kyaw
- University of Medicine 2, Khaymar Thi Rd, Yangon, Myanmar
| | - Htay Htay Tin
- University of Medical Technology, Insein Township, Yangon Yangon Division, Myanmar
| | - Yugo Shobugawa
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Hisami Watanabe
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Reiko Saito
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-754, Asahimachi-dori, Chuo-ku, Niigata, Japan.
| |
Collapse
|
2
|
Murayama Y, Aizawa Y, Ikuse T, Izumita R, Nukaga S, Kaneko M, Yamada T, Ono T, Matsui K, Suda M, Saitoh A. Acute Flaccid Myelitis With Human Rhinovirus A19 Detection: Case Report and Literature Review. Pediatr Infect Dis J 2024:00006454-990000000-00786. [PMID: 38451987 DOI: 10.1097/inf.0000000000004317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Human rhinovirus (HRV) has been sporadically detected in patients with acute flaccid myelitis (AFM). We report a case of AFM in a 2-year-old boy with severe neurologic sequelae, whose nasopharyngeal and stool samples tested positive for HRV-A19. Clinical information related to AFM with HRV is limited. Further study of the association of AFM with HRV is warranted.
Collapse
Affiliation(s)
- Yurie Murayama
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Ryohei Izumita
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Shunsuke Nukaga
- Department of Pediatrics, Niigata Prefectural Central Hospital, Niigata, Japan
| | - Masahiro Kaneko
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Takeshi Yamada
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Takeshi Ono
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Ko Matsui
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Masashi Suda
- Department of Pediatrics, Niigata Prefectural Central Hospital, Niigata, Japan
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| |
Collapse
|
3
|
Aizawa Y, Ikuse T, Izumita R, Habuka R, Yamanaka T, Saitoh A. Human Rhinovirus as a Cause of Fever in Neonates and Young Infants During the COVID-19 Pandemic, 2020-2022. Pediatr Infect Dis J 2024; 43:130-135. [PMID: 37851974 DOI: 10.1097/inf.0000000000004139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
BACKGROUND Human rhinovirus (HRV) was predominant and persistent during the coronavirus disease 2019 (COVID-19) pandemic despite nonpharmaceutical interventions. The data whether HRV persistence also occurred in neonates and young infants were very limited. METHODS This prospective observational study was conducted in Niigata, Japan, between January 2020 and September 2022. The participants were hospitalized neonates and infants less than 4 months of age with fever. We excluded patients with evidence of bacterial infection or obvious sick contact with influenza or respiratory syncytial virus infection, as confirmed by rapid antigen detection tests. COVID-19 diagnosed by polymerase chain reaction (PCR) or rapid antigen detection tests were also excluded. Parechovirus and enterovirus were examined by PCR using serum and/or cerebrospinal fluid. FilmArray Respiratory Panel v1.7 was conducted on nasopharyngeal swabs. If HRV was positive, the genotype was identified. RESULTS We included 72 patients (median age, 54 days; interquartile range, 28.5-79 days), and sepsis was diagnosed in 31 (43.1%) patients. In total, 27 (37.5%) patients had had positive multiplex PCR tests. These patients were more likely to have rhinorrhea ( P = 0.004), cough ( P = 0.01), and sick contact ( P < 0.001) than those who with negative multiplex PCR. HRV was the most frequently detected virus (n = 23, 85.2%), and species A (n = 15, 71.4%) and C (n = 6, 28.6%) were genotyped. No seasonality or monthly predominance of the specific HRV types was observed. CONCLUSIONS HRV was an important cause of fever in neonates and young infants during the COVID-19 pandemic, 2020 to 2022.
Collapse
Affiliation(s)
- Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Ryohei Izumita
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Department of Pediatrics, Niigata City General Hospital, Niigata, Japan
| | - Rie Habuka
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Department of Pediatrics, Niigata City General Hospital, Niigata, Japan
| | - Takayuki Yamanaka
- Department of Pediatrics, Niigata City General Hospital, Niigata, Japan
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
4
|
Aizawa Y, Saeki K, Mori K, Ikuse T, Izumita R, Saitoh A. An outbreak investigation of parechovirus-A3 in a newborn nursery. Infect Control Hosp Epidemiol 2024; 45:63-67. [PMID: 37448222 PMCID: PMC10782194 DOI: 10.1017/ice.2023.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/11/2023] [Accepted: 05/30/2023] [Indexed: 07/15/2023]
Abstract
OBJECTIVE To investigate parechovirus-A3 (PeV-A3) transmission in a newborn nursery, after encountering 3 neonates with fever and rash. DESIGN An observational study. SETTING At a newborn nursery at the general hospital in Hyogo, Japan. PARTICIPANTS Symptomatic neonates and their family members, and asymptomatic neonates born during the same period. METHODS PCR assays for PeV-A and genotyping were used for the investigation of PeV-A3. Preserved umbilical cords were used to identify the route of transmission. RESULTS PeV-A3 infection was confirmed in the three symptomatic neonates. The index case had fever and rash, and the 2 neonates treated later became symptomatic and had serum, cerebrospinal fluid, and stool specimens that were positive for PeV-A3 on PCR. The umbilical cord of the index case was positive for PeV-A3 on PCR. The family members of the index case, including the mother, were asymptomatic before delivery. The older sister and cousin of the PeV-A3-infected neonate had positive PCR results. The sequence analysis suggested 2 possible transmission routes: vertical and horizontal transmission in a newborn nursery and/or a family outside the hospital. The incubation period of PeV-A3 infection was estimated to be 1-3 days (maximum, 7 days). CONCLUSION Horizontal transmission of PeV-A3 was confirmed in a newborn nursery. Vertical transmission was suggested by the detection of RNA in an umbilical cord sample from the index case. These observations indicate that PeV-A3 can be horizontally transmitted in a newborn nursery and that special caution is required to prevent healthcare-associated transmission of PeV-A3.
Collapse
Affiliation(s)
- Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Keisuke Saeki
- Department of Pediatrics, Nishiwaki Municipal Hospital, Hyogo, Japan
| | - Kazuetsu Mori
- Department of Pediatrics, Nishiwaki Municipal Hospital, Hyogo, Japan
| | - Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Ryohei Izumita
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
5
|
Ikuse T, Aizawa Y, Hasegawa S, Takahashi M, Hayashi T, Kon M, Tamura T, Matsumoto H, Saitoh A. Incidence of Omicron Variant Reinfection and Reduction of Reinfection Risk After Coronavirus Disease 2019 Vaccination in Children. J Pediatric Infect Dis Soc 2023; 12:634-637. [PMID: 37936292 DOI: 10.1093/jpids/piad093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 10/31/2023] [Indexed: 11/09/2023]
Abstract
Data are limited on the incidence of coronavirus disease 2019 (COVID-19) reinfection in children. This population-based cohort study in Niigata, Japan from January to November 2022 demonstrated the incidence of reinfection was 1337/48 099 (2.8%), and the hazard ratio for reinfection in vaccinated children was 0.29 (95% confidence interval, 0.20-0.40).
Collapse
Affiliation(s)
- Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Satoshi Hasegawa
- Patient Coordinate Center, Niigata Prefectural Office, Niigata, Japan
| | - Masashi Takahashi
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan
| | - Takanori Hayashi
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan
| | - Miyako Kon
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan
| | - Tsutomu Tamura
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan
| | - Haruki Matsumoto
- Department of Health and Welfare, Niigata Prefectural Office, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
6
|
Tachikawa J, Aizawa Y, Kobayashi T, Ikuse T, Kamata K, Win SMK, Di Ja L, Thein KN, Win NC, Thida A, Tun A, Suzuki Y, Ito A, Osada H, Chon I, Phyu WW, Ota T, Kyaw Y, Tin HH, Watanabe K, Shobugawa Y, Watanabe H, Saito R, Saitoh A. Detection of parechovirus-A in hospitalized children with acute lower respiratory infection in Myanmar, 2017-2018. J Med Virol 2023; 95:e28964. [PMID: 37464903 DOI: 10.1002/jmv.28964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/19/2023] [Accepted: 07/05/2023] [Indexed: 07/20/2023]
Abstract
Parechovirus-A (PeV-A) causes emerging infection in children, and clinical presentation depends on genotype. The virus has been investigated mainly in developed countries; however, data from developing countries, especially in Asia, are sparse. This study investigated whether PeV-A circulated in children in Myanmar. This retrospective study evaluated PeV-A in nasopharyngeal samples from children aged 1 month to 12 years who were hospitalized with acute lower respiratory infection at Yankin Children Hospital, Yangon, Myanmar, during the period from May 2017 to April 2019. Real-time polymerase chain reaction (PCR) was used to detect PeV-A, and PCR-positive samples were used for genotyping and phylogenetic analysis. In total, 11/570 (1.9%) of samples were positive for PeV-A; 7 were successfully genotyped by sequencing the VP3/VP1 region, as follows: PeV-A1 (n = 4), PeV-A5 (n = 1), PeV-A6 (n = 1), and PeV-A14 (n = 1). Median age was 10.0 months (interquartile range 4.0-12.0 months), and other respiratory viruses were detected in all cases. Phylogenetic analysis showed that all detected PeV-A1 strains were in clade 1 A, which was a minor clade worldwide. Four PeV-A genotypes were detected in Myanmar. The clinical impact of PeV-A in children should be evaluated in future studies.
Collapse
Affiliation(s)
- Jun Tachikawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tetsuya Kobayashi
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kazuhiro Kamata
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Su Mon Kyaw Win
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Lasham Di Ja
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | | | - Nay Chi Win
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Aye Thida
- University of Medicine 2, Yangon, Myanmar
| | | | - Yuko Suzuki
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Ai Ito
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hidekazu Osada
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Irina Chon
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Wint Wint Phyu
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Tomomi Ota
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | | | | | - Kanako Watanabe
- Department of Medical Technology, Niigata University Graduate School of Health Sciences, Niigata, Japan
| | - Yugo Shobugawa
- Department of Active Ageing, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hisami Watanabe
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Reiko Saito
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
7
|
Ikuse T, Aizawa Y, Shobukawa Y, Tomiyama N, Nakayama H, Takahashi M, Muto K, Hasegawa S, Takahashi M, Kon M, Tamura T, Matsumoto H, Saito R, Saitoh A. Household Secondary Transmission of the Severe Acute Respiratory Syndrome Coronavirus 2 Alpha Variant From a Community Cluster in a Nursery in Japan. Pediatr Infect Dis J 2022; 41:e358-e364. [PMID: 35703299 PMCID: PMC9359683 DOI: 10.1097/inf.0000000000003607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/24/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Spread of variants of concerns (VOCs) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has led to an increase in children with coronavirus disease 2019 (COVID-19). In February 2021, clusters of the Alpha variant of SARS-CoV-2 started to be reported in Niigata, Japan, including a large nursery cluster. We investigated the transmission routes and household secondary attack rates (SARs) in this cluster. METHODS Epidemiologic data related to a nursery cluster in Niigata, Japan, particularly child-origin and adult-origin SARs, were analyzed. VOCs were confirmed by whole-genome sequencing of virus from patients. RESULTS In total, 42 persons (22 children and 20 adults) in the cluster were infected with the Alpha variant. In the nursery, 13 of 81 children (16.0%) and 4 of 24 teachers (16.7%) were infected. SARS-CoV-2 later spread to 25 persons (10 children and 15 adults) outside the nursery. Child-origin and adult-origin household SARs were 27.7% (13/47) and 47.0% (8/17) ( P = 0.11), respectively, which were higher than rates attributable to non-VOCs in previous studies. CONCLUSIONS As compared with non-VOCs, the Alpha variant of SARS-CoV-2 exhibited high transmissibility among children and adults and may pose a high risk for household secondary transmission from SARS-CoV-2-infected children. Increased transmissibility of current or future VOCs could lead to greater transmission from children to adults or other children.
Collapse
Affiliation(s)
- Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Yugo Shobukawa
- Department of Active Ageing, Niigata University Graduate School of Medical and Dental Sciences
| | - Nobuko Tomiyama
- Department of Health and Welfare, Niigata Prefectural Office
| | | | | | | | - Satoshi Hasegawa
- Department of Patient Coordinate Center, Niigata Prefectural Office
| | | | - Miyako Kon
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science
| | - Tsutomu Tamura
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science
| | | | - Reiko Saito
- Department of International Health (Public Health), Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| |
Collapse
|
8
|
Kamata K, Thein KN, Di Ja L, Win NC, Win SMK, Suzuki Y, Ito A, Osada H, Chon I, Phyu WW, Aizawa Y, Ikuse T, Ota T, Kyaw Y, Tin HH, Shobugawa Y, Watanabe H, Saito R, Saitoh A. Clinical manifestations and outcome of viral acute lower respiratory infection in hospitalised children in Myanmar. BMC Infect Dis 2022; 22:350. [PMID: 35395744 PMCID: PMC8992414 DOI: 10.1186/s12879-022-07342-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 03/25/2022] [Indexed: 02/03/2023] Open
Abstract
Background Acute lower respiratory infection (ALRI) remains the leading cause of death in children worldwide, and viruses have been the major cause of ALRI. In Myanmar, ALRI is associated with high morbidity and mortality in children, and detailed information on ALRI is currently lacking. Methods This prospective study investigated the viral aetiologies, clinical manifestations, and outcomes of ALRI in hospitalised children aged 1 month to 12 years at the Yankin Children Hospital, Yangon, Myanmar from May 2017 to April 2019. The sample size was set to 300 patients for each year. Two nasopharyngeal swabs were obtained for the patients with suspected viral ALRI; one for rapid tests for influenza and respiratory syncytial virus (RSV), and the other for real-time PCR for the 16 ALRI-causing viruses. Pneumococcal colonization rates were also investigated using real-time PCR. Clinical information was extracted from the medical records, and enrolled patients were categorised by age and severity for comparison. Results Among the 5463 patients admitted with a diagnosis of ALRI, 570 (10.4%) were enrolled in this study. The median age of the patients was 8 months (interquartile range, 4–15 months). The most common symptoms were cough (93%) and difficulty in breathing (73%), while the most common signs of ALRI were tachypnoea (78%) and chest indrawing (67%). A total of 16 viruses were detected in 502 of 570 patients’ samples (88%), with RSV B (36%) and rhinovirus (28%) being the most commonly detected. Multiple viruses were detected in 221 of 570 samples (37%) collected from 570 patients. Severe ALRI was diagnosed in 107 of 570 patients (19%), and RSV B and human rhinovirus were commonly detected. The mortality rate was 5%; influenza virus A (29%) and RSV B (21%) were commonly detected, and stunting and lack of immunization were frequently observed in such cases. Additionally, 45% (259/570) of the patients had pneumococcal colonization. Conclusions Viral ALRI in hospitalised children with a median of 8 months has significant morbidity and mortality rates in Myanmar. RSV and rhinovirus were the most commonly detected from nasopharyngeal swabs, while influenza virus and RSV were the most frequently associated with fatal cases. Supplementary Information The online version contains supplementary material available at 10.1186/s12879-022-07342-1.
Collapse
Affiliation(s)
- Kazuhiro Kamata
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar.,Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | | | - Lasham Di Ja
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Nay Chi Win
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Su Mon Kyaw Win
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Yuko Suzuki
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | - Ai Ito
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | - Hidekazu Osada
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar.,Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Irina Chon
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Wint Wint Phyu
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | - Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan
| | - Tomomi Ota
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Yadanar Kyaw
- Respiratory Medicine Department, Thingangyun Sanpya General Hospital, Yangon, Myanmar
| | - Htay Htay Tin
- Department of Medical Services, National Health Laboratory, Ministry of Health and Sports, Yangon, Myanmar
| | - Yugo Shobugawa
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Hisami Watanabe
- Infectious Diseases Research Center of Niigata University in Myanmar, Yangon, Myanmar
| | - Reiko Saito
- Division of International Health, Graduate School of Medical and Dental Science, Niigata University, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, Niigata, 951-8510, Japan.
| |
Collapse
|
9
|
Abstract
Incidences of community-acquired infectious diseases other than COVID-19 decreased during the coronavirus disease 2019 pandemic; however, exanthema subitum incidence before (2016-2019) and during the pandemic (2020) in Niigata, Japan, did not substantially differ, although the proportion of age less than 1-year-old was lower in 2020. These findings suggest that exanthema subitum is transmitted mainly among family members, not in the community.
Collapse
Affiliation(s)
- Jun Tachikawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Miyako Kon
- Niigata Prefectural Institute of Public Health and Environmental Sciences, Niigata, Japan
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
10
|
Fuse T, Ikuse T, Aizawa Y, Fuse M, Goto F, Okazaki M, Iwaya A, Saitoh A. Decline in pediatric admission on an isolated island in the COVID-19 pandemic. Pediatr Int 2022; 64:e15326. [PMID: 36331232 PMCID: PMC9538257 DOI: 10.1111/ped.15326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 07/28/2022] [Accepted: 08/03/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND A decrease in pediatric hospitalizations during the COVID-19 pandemic has been reported worldwide; however, few studies have examined areas with a limited number of COVID-19 cases, where influenced by viral interference by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is minimum. METHODS We conducted an epidemiological study of pediatric hospitalizations on Sado, an isolated island in Niigata, Japan, that was unique environment with few COVID-19 cases and reliable pediatric admissions monitoring. We compared numbers of monthly hospitalizations and associated diagnoses for the periods April 2016 to March 2020 (pre-pandemic period) and April 2020 to March 2021 (pandemic period). RESULTS Data were analyzed for 1,144 and 128 patients in the pre-pandemic and pandemic periods, respectively. We observed only three adults and no pediatric COVID-19 cases during the pandemic period. The number of monthly admissions was significantly lower in the pandemic period (median [interquartile ranges (IQR)]: 11.0 [7.0-14.0]) than in the pre-pandemic period (23.0 [20.8-28.3]; P < 0.001). Similar decreases were observed for hospitalizations due to respiratory tract infection (P < 0.01), but not for asthma exacerbation (P = 0.15), and gastrointestinal tract infection (P = 0.33). CONCLUSIONS Pediatric hospitalizations during the pandemic significantly decreased on an isolated Japanese island where COVID-19 was not endemic and all pediatric admissions were ascertainable. This observation highlights the impact of decreased travel and increased awareness of infection control measures on pediatric hospitalizations due to infectious diseases, not by the SARS-CoV-2 viral interference.
Collapse
Affiliation(s)
- Takuya Fuse
- Department of Pediatrics, JA Niigata Kouseiren Sado General Hospital, Niigata, Japan
| | - Tatsuki Ikuse
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yuta Aizawa
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Michiko Fuse
- Department of Pediatrics, JA Niigata Kouseiren Sado General Hospital, Niigata, Japan
| | - Fumihiro Goto
- Department of Pediatrics, JA Niigata Kouseiren Sado General Hospital, Niigata, Japan
| | - Minoru Okazaki
- Department of Pediatrics, JA Niigata Kouseiren Sado General Hospital, Niigata, Japan
| | - Atsushi Iwaya
- Department of Pediatrics, Ryotsu Hospital, Niigata, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
11
|
Aizawa Y, Shobugawa Y, Tomiyama N, Nakayama H, Takahashi M, Yanagiya J, Kaji N, Ikuse T, Izumita R, Yamanaka T, Hasegawa S, Tamura T, Saito R, Saitoh A. Coronavirus Disease 2019 Cluster Originating in a Primary School Teachers' Room in Japan. Pediatr Infect Dis J 2021; 40:e418-e423. [PMID: 34561385 PMCID: PMC8505149 DOI: 10.1097/inf.0000000000003292] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/19/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND School closures are a subject of debate during the present coronavirus disease 2019 (COVID-19) pandemic. Because children are not the main driver of COVID-19 transmission in the community, school education must be prioritized in conjunction with appropriate infection prevention and control measures, as determined by local COVID-19 incidence. METHODS We investigated the causes and transmission routes of a primary school cluster of COVID-19 that occurred during November and December 2020 in Niigata, Japan. RESULTS In the cluster, the virus spread among teachers, then from teachers to students, and then to their family members. This primary school cluster comprised 26 infected patients and included teachers (13/33, 39%), students (9/211, 4%), and family members (4/65, 6%). The secondary attack rate from the 3 index teachers to the remaining 30 teachers was 33%; however, the rate to students was only 4%. Factors contributing to cluster formation include the fact that 2 of the index teachers continued working while symptomatic and that the environment and infection prevention measures in the teachers' room were inadequate. CONCLUSIONS To open schools safely and without interruption, adequate measures to prevent COVID-19 infection in schools should be emphasized not only for children but also for teachers and their environment.
Collapse
Affiliation(s)
- Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yugo Shobugawa
- Department of Active Aging, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Nobuko Tomiyama
- Department of Health and Welfare, Niigata Prefectural Office, Niigata, Japan
| | - Hitoshi Nakayama
- Department of Health and Welfare, Niigata Prefectural Office, Niigata, Japan
| | - Masako Takahashi
- Department of Health and Welfare, Niigata Prefectural Office, Niigata, Japan
| | - Junko Yanagiya
- Department of Health and Welfare, Niigata Prefectural Office, Niigata, Japan
| | - Noriko Kaji
- Kashiwazaki Health Care Center, Niigata, Japan
| | - Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Ryohei Izumita
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Department of Pediatrics, Niigata City General Hospital, Niigata, Japan
| | - Takayuki Yamanaka
- Department of Pediatrics, Niigata City General Hospital, Niigata, Japan
| | - Satoshi Hasegawa
- Pediatric liaison, Niigata Prefectural Patient Control Center, Niigata, Japan
| | - Tsutomu Tamura
- Department of Virology, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan
| | - Reiko Saito
- Department of International Health (Public Health), Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| |
Collapse
|
12
|
Ikuse T, Aizawa Y, Yamanaka T, Habuka R, Watanabe K, Otsuka T, Saitoh A. Outbreak of Enterovirus D68 Among Children in Japan-Worldwide Circulation of Enterovirus D68 Clade B3 in 2018. Pediatr Infect Dis J 2021; 40:6-10. [PMID: 32947598 DOI: 10.1097/inf.0000000000002889] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Enterovirus D68 (EV-D68) causes asthma-like respiratory infection in children. Several EV-D68 outbreaks have been reported worldwide since the largest outbreak occurred in the United States in 2014. We experienced an accumulation of pediatric cases with asthma-like respiratory illness in Niigata, Japan, in 2018. STUDY DESIGN To determine whether EV-D68 was responsible for the case accumulation, this prospective observational study evaluated children hospitalized in 1 of 8 hospitals with asthma-like respiratory illness in Niigata, Japan, during October and November 2018. Diagnoses were made by EV-D68-specific RT-PCR using nasopharyngeal samples. The clade was identified by sequence analyses, and a phylogenetic tree was created. To evaluate seasonal variation, data from pediatric cases with asthma-like respiratory illness in 2018 were retrospectively analyzed. RESULTS In 2018, 114 children were hospitalized with asthma-like respiratory illness in October and November, and 47 nasopharyngeal samples were collected. EV-D68 was detected in 22/47 (47%) patients during the study period. The phylogenetic tree revealed that all strains belonged to the clade B3 branch, which has been detected worldwide every 2 years since 2014. CONCLUSIONS EV-D68 was the associated pathogen for asthma-like respiratory illness in children in Japan in 2018. Clade B3, the dominant clade in outbreaks worldwide, was responsible for the outbreak. Detection and detailed virologic analysis of EV-D68 is important as part of worldwide surveillance, as it will aid in understanding the epidemiologic characteristics of EV-D68 infection.
Collapse
Affiliation(s)
- Tatsuki Ikuse
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Yuta Aizawa
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | | | - Rie Habuka
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Kanako Watanabe
- Department of Medical Technology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Taketo Otsuka
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| | - Akihiko Saitoh
- From the Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences
| |
Collapse
|
13
|
Ikuse T, Aizawa Y, Yamanaka T, Habuka R, Watanabe K, Otsuka T, Saitoh A. 2635. Outbreak of Enterovirus D68 Among Children in Japan and Simultaneous Circulation of Clade B3 in Europe. Open Forum Infect Dis 2019. [PMCID: PMC6810360 DOI: 10.1093/ofid/ofz360.2313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Background Enterovirus D68 (EV-D68) is a re-emerging, high-morbidity pathogen that causes severe respiratory infection and acute flaccid myelitis in children. EV-D68 is phylogenetically divided into 4 major groups—clade A through D—and each clade has subclades defined by genetic variant. Outbreaks of all strains have been reported in more than 10 countries. However, no study has compared the viral genomic characteristics of EV-D68 in contemporaneous outbreaks in different countries. Methods An outbreak of EV-D68 in children younger than 15 years occurred in Niigata, Japan, from October through November 2018. The patients were admitted to hospital with respiratory distress and wheezing episodes. RNA extracted from nasopharyngeal samples was tested by EV-D68-specific PCR. Clade was determined by semi-nested PCR analysis of the VP1 region, and the phylogenetic tree of the VP1 sequence was constructed. To clarify viral genomic characteristics, we compared the clade to those of outbreaks occurring during 2014–2018 in other countries. Results EV-D68 testing of 47 patients yielded positive results for 22 (47%) (median age 4.6 years; IQR, 2.9–6.7), and 15 (69%) had a past medical history of allergic disease. No patient developed acute flaccid myelitis. The VP1 sequences from all isolates belonged to clade B3, the same clade detected during the 2015 outbreak in Japan (figure). Interestingly, EV-D68 outbreaks were reported in France and Italy (clades D1/B3 and D1, respectively) during this period. Although the EV-D68 clades responsible for outbreaks in 2014 differed by region, clade B3 is now the dominant clade and has caused concurrent EV-D68 outbreaks in children since 2015 (table). Conclusion In 2018, an EV-D68 clade B3 outbreak occurred among children in Niigata, Japan. This clade is now dominant and periodically circulates around the world. Because EV-D68 can cause simultaneous outbreaks worldwide and is associated with high morbidity, detailed real-time epidemiological surveillance of EV-D68 is warranted. ![]()
![]()
Disclosures All authors: No reported disclosures.
Collapse
|
14
|
Aizawa Y, Izumita R, Yamanaka T, Habuka R, Ikuse T, Watanabe K, Otsuka T, Saitoh A. 2585. Changing Epidemiological Profile of Infantile Parechovirus-A3 Infection in Japan. Open Forum Infect Dis 2019. [PMCID: PMC6810139 DOI: 10.1093/ofid/ofz360.2263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background Methods Results Conclusion Disclosures
Collapse
|
15
|
Kuro T, Okahara A, Nose M, Ikuse T, Matsumura Y. Effects of SA7060, a novel dual inhibitor of neutral endopeptidase and angiotensin-converting enzyme, on deoxycorticosterone acetate-salt-induced hypertension in rats. Biol Pharm Bull 2000; 23:820-5. [PMID: 10919359 DOI: 10.1248/bpb.23.820] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We evaluated whether a novel dual inhibitor of neutral endopeptidase (NEP) and angiotensin-converting enzyme (ACE), SA7060, (S)-2-[3-[(S)-2-(butoxycarbonyl)-2-hydroxyethyl]-3-isobutylureido] -3-(2-naphtyl) propionic acid, prevents deoxycorticosterone acetate (DOCA)-salt-induced hypertension and related organ damage, such as cardiovascular hypertrophy, renal dysfunction and renal tissue injury in rats. The effectiveness was compared with candoxatril and enalapril, which are a selective NEP and ACE inhibitor, respectively. During DOCA-salt treatment for 4 weeks, the rats were given SA7060, candoxatril, enalapril or vehicle, once daily by gavage. The 4-weeks treatment with DOCA and salt produced progressive increases in systolic blood pressure. Daily administration of SA7060, candoxatril or enalapril significantly suppressed the development of hypertension induced by DOCA and salt, although the effect of enalapril was less potent at 4-weeks of the treatment period. In vehicle-treated DOCA-salt rats, decreases in creatinine clearance and increases in urinary excretion of protein and blood urea nitrogen were observed. This functional damage was improved most efficiently by the treatment with SA7060. There were significant increases in urinary excretions of atrial natriuretic peptide and cyclic GMP in SA7060- or candoxatril-treated animals. Histopathological examination of the kidney in DOCA-salt rats revealed tubular, glomerular and vascular lesions, all of which were improved in animals given SA7060 or candoxatril. When the vascular hypertrophy of the aorta was evaluated, there were significant increases in wall thickness, wall area and the wall-to-lumen ratio in vehicle-treated DOCA-salt rats compared with the sham rats. The development of vascular hypertrophy was suppressed by the treatment with SA7060, candoxatril or enalapril. Our findings indicate that SA7060 efficiently prevents DOCA-salt-induced hypertension and related tissue injury, mainly by inhibiting NEP. Thus, SA7060 may be useful for treatment of both renin-dependent and renin-independent hypertensive subjects, although further studies examining efficiency in a renin-dependent hypertensive model are needed.
Collapse
Affiliation(s)
- T Kuro
- Department of Pharmacology, Osaka University of Pharmaceutical Sciences, Takatsuki, Japan
| | | | | | | | | |
Collapse
|
16
|
Okahara A, Nomura A, Tanioka H, Sakamoto H, Yamashita K, Ikuse T. COLLABORATIVE WORK TO EVALUATE TOXICITY ON MALE REPRODUCTIVE ORGANS BY REPEATED DOSE STUDIES IN RATS : 5)EFFECTS OF REPEATED DOSES OF FLUTAMIDE FOR 2 AND 4 WEEKS. J Toxicol Sci 2000; 25 Spec No:63-70. [PMID: 11349456 DOI: 10.2131/jts.25.specialissue_63] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Flutamide, a nonsteroidal antiandrogen, was administered orally to 8-week (for the 2 week study) and 6-week-old (for the 4 week study) male Crj:CD(SD) rats at dose levels of 0 mg/kg, 60 mg/kg and 200 mg/kg daily for 2 weeks or 4 weeks in order to determine whether a 2 week treatment period is sufficient for detection of drug effects on the male reproductive system. Flutamide treatment for 4 weeks resulted in decreased organ weights of the epididymides and prostate, decreased sperm counts and Leydig cell proliferation in the testes at 60 mg/kg and 200 mg/kg. Decreased sperm motility and histological lesions in the seminiferous tubules were observed at 200 mg/kg. Flutamide treatment for 2 weeks decreased organ weight of epididymides and prostate and caused Leydig cell proliferation in the testes at 60 mg/kg and 200 mg/kg. Decreased sperm counts and sperm motility, and histological lesions in seminiferous tubules were observed at 200 mg/kg. The results of this study showed that 2 weeks treatment with flutamide causes histological lesions of testes and disorders of sperm parameters similar to those observed with 4 weeks treatment, indicating that 2 weeks treatment is sufficient for detection of effects of flutamide on the male reproductive system.
Collapse
Affiliation(s)
- A Okahara
- Santen Pharmaceutical Co., Ltd., Developmental Research Division, 3-9-19 Shimoshinjo, Higashiyodogawa-ku, Osaka 533-8651, Japan
| | | | | | | | | | | |
Collapse
|
17
|
Kawazu K, Shiono H, Tanioka H, Ota A, Ikuse T, Takashina H, Kawashima Y. Beta adrenergic antagonist permeation across cultured rabbit corneal epithelial cells grown on permeable supports. Curr Eye Res 1998; 17:125-31. [PMID: 9523089 DOI: 10.1076/ceyr.17.2.125.5598] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
PURPOSE To determine whether cultured rabbit corneal epithelial cells (RCEC), grown on permeable supports, provide a suitable in vivo model for characterizing transcellular drug permeation and metabolism. METHODS Primary rabbit corneal epithelial cells grown in DMEM-F12 were seeded on Transwell-COL inserts coated with fibronectin. The epithelial barrier integrity was evaluated, based on measurements of 14C-mannitol and 3H-PEG900, and their transepithelial electrical resistance (TEER). Ultrastructure evaluation was based on scanning electron microscopy and transmission electron microscopy, which were performed 8 days after seeding. Measurements of beta adrenergic antagonist permeability were performed to assess transcellular permeability. RESULTS Eight days after seeding, the TEER reached a peak of 144 omega.cm2 and the 14C-mannitol and 3H-PEG900 permeabilities were 6.8 x 10(-6) and 2.9 x 10(-6) cm/sec, respectively. Ultrastructural analysis revealed a multilayered structure with numerous microplicae and typical cytoplasmic organelles along with desmosomes. The relationship between permeation of beta-blockers and lipophilicity resembled the intact isolated cornea. CONCLUSIONS This is the first description of cultured RCEC grown on permeable support. Many of its properties mimic those described in the intact corneal epithelium. Even though its electrical tightness is less than that of the intact cornea, the transcellular permeability to lipophilic beta-antagonists is comparable to the isolated preparation. Therefore, this model will facilitate characterization of ocular permeation mechanisms of hydrophobic drugs whose route of permeation is transcellular.
Collapse
Affiliation(s)
- K Kawazu
- Santen Pharmaceutical Co., Ltd. Ophthalmic Laboratories, Ikomo-shi, Japan
| | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
OBJECTIVE AND DESIGN We reported previously that the betamethasone derivative betamethasone dipropionate behaves as an anti-glucocorticoid in rat endotoxin-induced uveitis (EIU). In the present study, we produced EIU in guinea pigs and investigated the effects of betamethasone dipropionate on the EIU. MATERIAL Male Hartley guinea pigs were used. TREATMENT Glucocorticoids were instilled into the eye. METHOD To elicit EIU, lipopolysaccharide (LPS) was injected into the anterior chamber of the eye. Cell numbers in the aqueous humor after LPS injection were determined by flow cytometry. Prostaglandin E2 (PGE2) production after LPS injection into the anterior chamber was also examined. RESULTS Intracameral injection of LPS (1 microgram/eye) induced cell infiltration into the anterior chamber and PGE2 production. Betamethasone dipropionate inhibited cell infiltration and PGE2 production more strongly than betamethasone. These results suggest that betamethasone dipropionate is a potent glucocorticoid in guinea pigs. CONCLUSIONS Structure-activity relationships of glucocorticoids in the guinea pig EIL model may differ from those in the rat EIU model.
Collapse
Affiliation(s)
- F Tsuji
- Discovery Research Division, Santen Pharmaceutical Co. Ltd., Osaka, Japan
| | | | | | | |
Collapse
|
19
|
Takase K, Ikuse T, Aono H, Okahara A. Toxicity study of the angiotensin converting enzyme inhibitor rentiapril in rats. Arzneimittelforschung 1995; 45:15-8. [PMID: 7893262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A three-months toxicity study of an angiotensin converting enzyme (ACE) inhibitor, rentiapril (CAS 80830-42-8), was performed in Sprague-Dawley rats by oral administration. The dose levels of 0, 30, 125, 500 and 1000 mg/kg were tested in both sexes, in which each experimental group comprised 10 rats. Another ACE inhibitor, captopril, was used as a reference compound. Rentiapril at the highest dose of 1000 mg/kg caused low food consumption and death of some animals with signs of bloody feces and anemia. In males and females receiving 500 and 1000 mg/kg, there were low body weight gain, increases in water intake, urine volume and serum BUN level, and decreases in levels of various erythrocytic parameters. Kidney weight was increased dose-dependently in both sexes. Histopathologically, renal changes in the 500 and 1000 mg/kg groups consisted of proximal tubular degeneration, juxtaglomerular cell hyperplasia and interstitial cell infiltration. Similar, but mild, changes in proximal tubules were present in the female 125 mg/kg group. Dead animals from the highest dose groups further showed gastrointestinal hemorrhagic erosion and/or ulcer, decreased bone marrow erythropoiesis and hepatocytic vacuolar degeneration. There was no pathological alteration in rats from other rentiapril-treated groups, as well as in controls. These results indicate that the no-effect dose of rentiapril in rats by three months oral administration is 30 mg/kg in female and 125 mg/kg in male, and suggest that, like other ACE-inhibitors, this compound also has a toxic potential to affect renal tissues.
Collapse
Affiliation(s)
- K Takase
- Development Research Laboratories, Santen Pharmaceutical Co., Ltd., Osaka, Japan
| | | | | | | |
Collapse
|
20
|
Nakata K, Nishimura K, Takada T, Ikuse T, Yamauchi H, Iso T. Effects of an angiotensin-converting enzyme (ACE) inhibitor, SA446, on tissue ACE activity in normotensive, spontaneously hypertensive, and renal hypertensive rats. J Cardiovasc Pharmacol 1987; 9:305-10. [PMID: 2437397 DOI: 10.1097/00005344-198703000-00007] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Effects of an angiotensin-converting enzyme (ACE) inhibitor, SA446, on the renin-angiotensin system, particularly on tissue ACE activity, were studied in Wistar-Kyoto normotensive rats (WKY), spontaneously hypertensive rats (SHR), and two-kidney, one-clip renal hypertensive rats (RHR) by repeated oral administration for 7 days. SA446 (45 mg/kg/day p.o.) inhibited ACE activity in the lung, brain, kidney, heart, and whole blood throughout the administration period in WKY, but showed a slight hypotensive action and no inhibition of aorta ACE activity. On the other hand, SA446 had an apparent hypotensive action at the same dose in SHR and inhibited ACE activity significantly in the aorta as well as the kidney and whole blood during the administration period. Furthermore, enzyme activity in the aorta, kidney, heart, and whole blood was also inhibited at a hypotensive dose of SA446 (10 mg/kg/day p.o.) in RHR. The inhibition in whole blood and kidney was almost complete, and the inhibition in the aorta was greater on day 7 than on day 1. The maximum decrease of blood pressure was correlated with the maximum inhibition in aorta ACE activity, but not in brain, lung, or heart ACE activity. In addition, a good positive correlation was observed between the basal blood pressure and the basal aorta ACE activity in WKY, SHR, and RHR, although there was no correlation in the brain, lung, kidney, heart, or whole blood. These results suggest that the antihypertensive action of SA446 by repeated administration may be due to inhibition of arterial ACE activity in addition to inhibition of plasma and kidney ACE activity.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|