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Varella K, Andrade-Silva BED, Costa-Neto SFD, Oliveira Cruz BAD, Maldonado Junior A, Gentile R. Helminth community of Nectomys squamipes naturally infected by Schistosoma mansoni in an endemic area in Brazil: A comparison of 22 years apart. Int J Parasitol Parasites Wildl 2024; 24:100941. [PMID: 38807751 PMCID: PMC11131069 DOI: 10.1016/j.ijppaw.2024.100941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/06/2024] [Accepted: 05/07/2024] [Indexed: 05/30/2024]
Abstract
The municipality of Sumidouro in the state of Rio de Janeiro, southeastern Brazil, is considered an area with low endemicity of Schistosoma mansoni. In this municipality, the wild water rat Nectomys squamipes is a wild reservoir of S. mansoni. A helminth community survey was carried out on N. squamipes populations in Sumidouro from 1997 to 1999. In the present study, we compared the helminth fauna and the helminth community structure of N. squamipes with a recent survey after a 22-year time interval, considering that the prevalence of S. mansoni infection in humans remained stable and that the area showed the same environmental characteristics. Seventy-three host specimens of N. squamipes collected between 1997 and 1999 and 21 specimens collected in 2021 were analyzed in this study. Seven helminth species were found in each collection period. The nematode Syphacia evaginata was recorded for the first time in N. squamipes in 2021. Syphacia venteli was the most abundant species in both periods and the most prevalent in 2021. During the period from 1997 to 1999, the most prevalent species was Hassalstrongylus epsilon. Significant differences in prevalence and abundance in relation to host sex were observed only for S. mansoni in 1997-1999. Significant differences in the abundance of the helminth species over time were observed only in Physaloptera bispiculata. Hassalstrongylus epsilon, S. venteli and S. mansoni were the dominant species in both periods. Litomosoides chagasfilhoi, Echinostoma paraensei paraensei and P. bispiculata became dominant, codominant and subordinate, respectively, over time. In conclusion, the helminth community of N. squamipes remained stable, with similar species richness, prevalence and abundance values and low beta-diversity over time. The occurrence of S. mansoni in the water rat has remained stable for decades, highlighting its importance for schistosomiasis control.
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Affiliation(s)
- Karina Varella
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Beatriz Elise de Andrade-Silva
- Pós-Doutorado Nota 10 – 2021, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Brena Aparecida de Oliveira Cruz
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Arnaldo Maldonado Junior
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Rosana Gentile
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
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Marinho-Júnior JF, Monteiro JFCLS, Sales de Carvalho AW, de Carvalho FG, de Paiva Cavalcanti M, Shaw J, Courtenay O, Brandão-Filho SP. High levels of infectiousness of asymptomatic Leishmania (Viannia) braziliensis infections in wild rodents highlights their importance in the epidemiology of American Tegumentary Leishmaniasis in Brazil. PLoS Negl Trop Dis 2023; 17:e0010996. [PMID: 36716345 PMCID: PMC9910795 DOI: 10.1371/journal.pntd.0010996] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 02/09/2023] [Accepted: 11/29/2022] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The epidemiological significance of wildlife infections with aetiological agents causing human infectious diseases is largely determined by their infection status, contact potential with humans (via vectors for vector-borne diseases), and their infectiousness to maintain onward transmission. This study quantified these parameters in wild and synanthropic naturally infected rodent populations in an endemic region of tegumentary leishmaniasis in northeast Brazil. METHODS Capture-mark-recapture (CMR) of rodents was conducted over 27 months in domestic/peri domestic environs, household plantations and nearby Atlantic Forest (9,920 single trap nights). Rodent clinical samples (blood and ear tissue) were tested for infection by conventional PCR and quantitative PCR (qPCR) for Leishmania (Viannia) braziliensis, and xenodiagnosis to measure infectiousness to the local sand fly vector. RESULTS A total 603 individuals of 8 rodent species were (re)captured on 1,051 occasions. The most abundant species were Nectomys squamipes (245 individuals, 41% of the total catch), Rattus rattus (148, 25%), and Necromys lasiurus (83, 14%). All species were captured in greater relative frequencies in plantations; R. rattus was the only species captured in all three habitats including in and around houses. Four species, comprising 22.6% of individuals captured at least twice, were geolocated in more than one habitat type; 78.6% were infected with L. (V.) braziliensis, facilitating inter-species and inter-habitat transmission. Species specific period prevalence ranged between 0%-62% being significantly higher in N. squamipes (54-62%) and Hollochillus sciureus (43-47%). Xenodiagnosis was performed on 41 occasions exposing 1,879 Nyssomyia whitmani sand flies to five rodent species (37 individuals). Similar mean levels of infectiousness amongst the more common rodent species were observed. Longitudinal xenodiagnosis of the N. squamipes population revealed a persistent level of infectiousness over 13 months follow-up, infecting a median 48% (IQR: 30.1%-64.2%) of exposed blood-fed vectors. The proportion of exposed flies infected was greater in the low compared to in the high seasonal period of vector abundance. L. (V.) braziliensis parasite loads in rodent blood quantified by qPCR were similar across rodent species but did not represent a reliable quantitative marker of infectiousness to sand flies. The standardised risk of rodent infection in plantations was 70.3% relative to 11.3% and 18.4% in peri domestic and forest habitats respectively. R. rattus was the only exception to this trend indicating greatest risk in the peri domestic environment. CONCLUSIONS The results support the view that a collective assemblage of wild and synanthropic rodent species is an important wild reservoir of L. (V.) braziliensis in this region, with N. squamipes and R. rattus probably playing a key role in transmission within and between habitat types and rodent species. Rodents, and by implication humans, are at risk of infection in all sampled habitats, but more so in homestead plantations. These conclusions are based on one of the longest CMR study of small rodents in an American Tegumentary Leishmaniasis (ATL) foci.
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Affiliation(s)
| | | | | | - Francisco Gomes de Carvalho
- Department of Immunology, Instituto Aggeu Magalhães/FIOCRUZ, Cidade Universitária, Recife, Pernambuco, Brazil
| | - Milena de Paiva Cavalcanti
- Department of Immunology, Instituto Aggeu Magalhães/FIOCRUZ, Cidade Universitária, Recife, Pernambuco, Brazil
| | - Jeffrey Shaw
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Orin Courtenay
- The Zeeman Institute and School of Life Sciences, University of Warwick, Coventry, United Kingdom
- * E-mail: (SPBF); (OC)
| | - Sinval Pinto Brandão-Filho
- Department of Immunology, Instituto Aggeu Magalhães/FIOCRUZ, Cidade Universitária, Recife, Pernambuco, Brazil
- * E-mail: (SPBF); (OC)
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Davis AJ, Farrar R, Jump B, Hall P, Guerrant T, Pepin KM. An efficient method of evaluating multiple concurrent management actions on invasive populations. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2022; 32:e2623. [PMID: 35397129 DOI: 10.1002/eap.2623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 01/18/2022] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
Evaluating the efficacy of management actions to control invasive species is crucial for maintaining funding and to provide feedback for the continual improvement of management efforts. However, it is often difficult to assess the efficacy of control methods due to limited resources for monitoring. Managers may view effort on monitoring as effort taken away from performing management actions. We developed a method to estimate invasive species abundance, evaluate management effectiveness, and evaluate population growth over time from a combination of removal activities (e.g., trapping, ground shooting) using only data collected during removal efforts (method of removal, date, location, number of animals removed, and effort). This dynamic approach allows for abundance estimation at discrete time points and the estimation of population growth between removal periods. To test this approach, we simulated over 1 million conditions, including varying the length of the study, the size of the area examined, the number of removal events, the capture rates, and the area impacted by removal efforts. Our estimates were unbiased (within 10% of truth) 81% of the time and were correlated with truth 91% of the time. This method performs well overall and, in particular, at monitoring trends in abundances over time. We applied this method to removal data from Mingo National Wildlife Refuge in Missouri from December 2015 to September 2019, where the management objective is elimination. Populations of feral swine on Mingo NWR have fluctuated over time but showed marked declines in the last 3-6 months of the time series corresponding to increased removal pressure. Our approach allows for the estimation of population growth across time (from both births and immigration) and therefore, provides a target removal rate (above that of the population growth) to ensure the population will decline. In Mingo NWR, the target monthly removal rate is 18% to cause a population decline. Our method provides advancement over traditional removal modeling approaches because it can be applied to evaluate management programs that use a broad range of removal techniques concurrently and whose management effort and spatial coverage vary across time.
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Affiliation(s)
- Amy J Davis
- National Wildlife Research Center, Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, Fort Collins, Colorado, USA
| | - Randy Farrar
- Wildlife Services, Animal Plant Health Inspection Service, United States Department of Agriculture, Puxico, Missouri, USA
| | - Brad Jump
- Wildlife Services, Animal Plant Health Inspection Service, United States Department of Agriculture, Marshfield, Missouri, USA
| | - Parker Hall
- Wildlife Services, Animal Plant Health Inspection Service, United States Department of Agriculture, Gainesville, Florida, USA
| | - Travis Guerrant
- Wildlife Services, Animal Plant Health Inspection Service, United States Department of Agriculture, Columbia, Missouri, USA
| | - Kim M Pepin
- National Wildlife Research Center, Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, Fort Collins, Colorado, USA
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Rodrigues DP, Konzen MQ, Decian VS, Hartmann M, Galiano D, Hartmann PA. Response of small mammal species to landscape metrics in a highly fragmented area in the Atlantic forest of southern Brazil. MAMMALIA 2022. [DOI: 10.1515/mammalia-2021-0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The high rate of destruction of natural habitats has diminished fragments size, which negatively impacts small mammal community species richness and composition. We investigated the abundance of small non-flying mammal species in association with three landscape metrics: the size of the fragment (AREA); the shape index of the fragment (SHAPE); and the size of the central area of the fragment (CORE) in six forest fragments in a highly fragmented landscape of southern Brazil. Three rodent species (Akodon montensis, Oligoryzomys nigripes, Sooretamys angouya) and one marsupial species (Gracilinanus microtarsus) were captured in total. We used generalized linear models to test the influence of the landscape metrics on the abundance of the three most abundant species of small mammals captured (A. montensis, O. nigripes and S. angouya). Among the three species analyzed, A. montensis presented a significant negative association with the metric CORE; O. nigripes and S. angouya presented a positive association with the metric AREA and negative with the metric CORE. The negative association of A. montensis, O. nigripes and S. angouya with the core area of the fragments, and the absence of association of all species with the shape of the fragments indicate that these species might benefit from the effects of habitat fragmentation.
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Affiliation(s)
- Daniele Pereira Rodrigues
- Laboratório de Ecologia e Conservação, Universidade Federal da Fronteira Sul, Campus Erechim , ERS 135 - Km 72, n°200 , Erechim , RS , Brazil
| | - Maurício Quoos Konzen
- Laboratório de Ecologia e Conservação, Universidade Federal da Fronteira Sul, Campus Erechim , ERS 135 - Km 72, n°200 , Erechim , RS , Brazil
| | - Vanderlei Secretti Decian
- Programa de Pós-Graduação em Ecologia, Universidade Regional Integrada do Alto Uruguai e das Missões, Campus Erechim , Av. Sete de Setembro, 1621 , Erechim , RS , Brazil
| | - Marilia Hartmann
- Laboratório de Ecologia e Conservação, Universidade Federal da Fronteira Sul, Campus Erechim , ERS 135 - Km 72, n°200 , Erechim , RS , Brazil
| | - Daniel Galiano
- Laboratório de Zoologia, Universidade Federal da Fronteira Sul, Campus Realeza , Rua Edmundo Gaievisk, 1000 , Realeza , PR , Brazil
| | - Paulo Afonso Hartmann
- Laboratório de Ecologia e Conservação, Universidade Federal da Fronteira Sul, Campus Erechim , ERS 135 - Km 72, n°200 , Erechim , RS , Brazil
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Rodriguez de Rivera O, McCrea R. Removal modelling in ecology: A systematic review. PLoS One 2021; 16:e0229965. [PMID: 33661897 PMCID: PMC7932160 DOI: 10.1371/journal.pone.0229965] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 01/15/2021] [Indexed: 11/18/2022] Open
Abstract
Removal models were proposed over 80 years ago as a tool to estimate unknown population size. More recently, they are used as an effective tool for management actions for the control of non desirable species, or for the evaluation of translocation management actions. Although the models have evolved over time, in essence, the protocol for data collection has remained similar: at each sampling occasion attempts are made to capture and remove individuals from the study area. Within this paper we review the literature of removal modelling and highlight the methodological developments for the analysis of removal data, in order to provide a unified resource for ecologists wishing to implement these approaches. Models for removal data have developed to better accommodate important features of the data and we discuss the shift in the required assumptions for the implementation of the models. The relative simplicity of this type of data and associated models mean that the method remains attractive and we discuss the potential future role of this technique.
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Affiliation(s)
- Oscar Rodriguez de Rivera
- Statistical Ecology @ Kent, National Centre for Statistical Ecology, School of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, United Kingdom
- * E-mail:
| | - Rachel McCrea
- Statistical Ecology @ Kent, National Centre for Statistical Ecology, School of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, United Kingdom
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Toledo G, Astúa D. A successful multiple litter adoption in a nursing southern black-eared opossum, Didelphis aurita (Didelphimorphia, Didelphidae). BEHAVIOUR 2020. [DOI: 10.1163/1568539x-bja10030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Adoption by an alloparent of an offspring or a litter occurs in at least eight mammal orders, but is rare in marsupials, and was never confirmed in opossums. Here we report the first unequivocal and documented successful event of alloparental adoption of two distinct litters by a single captive female Southern Black-eared Opossum Didelphis aurita (Didelphimorphia, Didelphidae). The female, still nursing her biological litter, accepted and nursed the two offered litters. All three litters were raised simultaneously, and the female cared for and displayed protective behaviour indistinctively of the biological or adopted pups. She was kept captive until released along with her biological litter, which was weaned and fled independently, and the two adoptive litters clinging on her back. This event sheds additional light on the little known social and maternal behaviour of opossums, suggesting it is possibly more complex than originally thought.
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Affiliation(s)
- Gabriela Toledo
- aProBicho Centro Veterinário, Av. Nossa Sra. da Assunção 461, Butantã 05359-000, São Paulo, SP, Brazil
| | - Diego Astúa
- bLaboratório de Mastozoologia, Departamento de Zoologia, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, s.n., Cidade Universitária, 50670-901 Recife, PE, Brazil
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Investigation of Bartonella spp. in brazilian mammals with emphasis on rodents and bats from the Atlantic Forest. INTERNATIONAL JOURNAL FOR PARASITOLOGY-PARASITES AND WILDLIFE 2020; 13:80-89. [PMID: 32904298 PMCID: PMC7452516 DOI: 10.1016/j.ijppaw.2020.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 07/08/2020] [Accepted: 07/08/2020] [Indexed: 02/06/2023]
Abstract
The Bartonella species are zoonotic agents that infect mammals and are transmitted by arthropod vectors. Approximately 18 distinct genotypes cause diseases in humans, and may be spread by both domestic and wild animals. In Brazil, Bartonella genotypes have been identified in several species of wild mammals, and in the present study, we analyzed samples from non-human primates (marmosets), marsupials, rodents, and bats, and compared them with the genotypes described in mammals from Brazil, to examine the distribution of Bartonella genotypes in two impacted areas of Rio de Janeiro state, in southeastern Brazil. We used polymerase chain reaction (PCR) methods to detect the Bartonella DNA using partial sequences of the gltA, ftsZ, and groEL genes. We generated Bayesian inference and maximum likelihood trees to characterize the positive PCR samples and infer the phylogenetic relationships of the genotypes. A total of 276 animals were captured, including 110 bats, 91 rodents, 38 marsupials, and 37 marmosets. The DNA of Bartonella was amplified from tissue samples collected from 12 (4.34%) of the animals, including eight rodents – Akodon cursor (5/44) and Nectomys squamipes (3/27) – and four bats, Artibeus lituratus (3/58) and Carollia perspicillata (1/15). We identified Bartonella genotypes closely related to those described in previous studies, as well as new genotypes in both the rodent and the bat samples. Considering the high diversity of the Bartonella genotypes and hosts identified in the present study, further research is needed to better understand the relationships between the different Bartonella genotypes and their vectors and host species. The presence of Bartonella in the wild rodents and bats from the study area indicates that the local human populations may be at risk of infection by Bartonella due to the spillover of these strains from the wild environment to domestic and peri-domestic environments. First record of wild mammals with Bartonella DNA at northwestern of Rio de Janeiro. The genotypes of Bartonella were characterized in two species of cricetid rodents and two species of phyllostomid bats from Rio de Janeiro. The genotype of Bartonella in Akodon cursor was identified closely related to B. rochalimae. This is the first report of Bartonella in C. perspicillata from Rio de Janeiro state, based on the analysis of tissue samples.
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Kersul MG, Costa NA, Boullosa RG, Silva AAS, Rios ÉO, Munhoz AD, Andrade-Silva BE, Maldonado A, Gentile R, Alvarez MR. Helminth communities of sigmonontine rodents in cocoa agroforestry systems in Brazil. INTERNATIONAL JOURNAL FOR PARASITOLOGY-PARASITES AND WILDLIFE 2019; 11:62-71. [PMID: 32274328 PMCID: PMC7131998 DOI: 10.1016/j.ijppaw.2019.11.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 11/18/2019] [Accepted: 11/30/2019] [Indexed: 12/26/2022]
Abstract
Agroforestry is an alternative kind of land use where the native vegetation is surrounded or intercalated by crops of economic interest. This system may maintain species richness by promoting the habitat heterogeneity or serving as ecological corridors. The aim of this study was to describe the gastrointestinal helminth fauna and to analyse the parasitological parameters of the helminth communities of six sigmodontine rodents in a cocoa agroforestry system in the municipality of Ilhéus, state of Bahia, Northeast Brazil. This is a novel study of helminth fauna in this kind of agroforestry. Rodents were captured in live-traps and euthanised for helminth recovery. Specimens were counted and identified to the species level whenever possible. Helminth abundance, intensity, and prevalence were calculated for each species and each host. The total abundance and prevalence of helminths were compared among localities and three attributes of the host: species, gender and age using generalised linear models. Considering all rodents, 52.14% of them were parasitised with at least one helminth species. Eight nematode species were identified and another seven morphospecies were identified to the genus level. The most abundant species were Hassalstrongylus epsilon, Stilestrongylus eta, Guerrerostrongylus zetta, and Syphacia alata. The opportunistic host species Oligoryzomys nigripes and Akodon cursor, besides the water rat Nectomys squamipes, were the most infected species for helminth parasites. Hylaeamys seuanezi was also an important host with the highest helminth species richness. This is the first report of the helminth fauna for this host. The locality most distant from the native vegetation and closest to the city had the highest helminth prevalence and mean species richness. The species richness in the helminth communities of Euryoryzomys russatus, N. squamipes and O. nigripes in these Cabruca agroforestries were within the range found in studies carried out in Atlantic Forest areas.
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Affiliation(s)
- Maíra G Kersul
- Programa de Pós-Graduação em Ciência Animal, Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, 45662-900, Ilhéus, Bahia, Brazil
| | - Natália A Costa
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil.,Programa de Pós-Graduação em Biologia Parasitátia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Avenida Brasil, 4.365, Manguinhos, 21040-360, Rio de Janeiro, RJ, Brazil
| | - Raquel G Boullosa
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil.,Programa de Pós-Graduação em Biodiversidade e Saúde, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Avenida Brasil, 4.365, Manguinhos, 21040-360, Rio de Janeiro, RJ, Brazil
| | - Adna A S Silva
- Programa de Pós-Graduação em Zoologia, Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, 45662-900, Ilhéus, Bahia, Brazil
| | - Élson O Rios
- Coleção de Mamíferos "Alexandre Rodrigues Ferreira" (CMARF), Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, 45662-900, Ilhéus, Bahia, Brazil
| | - Alexandre D Munhoz
- Departamento de Ciências Agrárias e Ambientais, Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, 45662-900, Ilhéus, Bahia, Brazil
| | - Beatriz E Andrade-Silva
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil.,Programa de Pós-Graduação em Biologia Parasitátia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Avenida Brasil, 4.365, Manguinhos, 21040-360, Rio de Janeiro, RJ, Brazil
| | - Arnaldo Maldonado
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Rosana Gentile
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Martin R Alvarez
- Coleção de Mamíferos "Alexandre Rodrigues Ferreira" (CMARF), Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, 45662-900, Ilhéus, Bahia, Brazil
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Muylaert RL, Bovendorp RS, Sabino-Santos G, Prist PR, Melo GL, Priante CDF, Wilkinson DA, Ribeiro MC, Hayman DTS. Hantavirus host assemblages and human disease in the Atlantic Forest. PLoS Negl Trop Dis 2019; 13:e0007655. [PMID: 31404077 PMCID: PMC6748440 DOI: 10.1371/journal.pntd.0007655] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 09/17/2019] [Accepted: 07/24/2019] [Indexed: 11/18/2022] Open
Abstract
Several viruses from the genus Orthohantavirus are known to cause lethal disease in humans. Sigmodontinae rodents are the main hosts responsible for hantavirus transmission in the tropical forests, savannas, and wetlands of South America. These rodents can shed different hantaviruses, such as the lethal and emerging Araraquara orthohantavirus. Factors that drive variation in host populations may influence hantavirus transmission dynamics within and between populations. Landscape structure, and particularly areas with a predominance of agricultural land and forest remnants, is expected to influence the proportion of hantavirus rodent hosts in the Atlantic Forest rodent community. Here, we tested this using 283 Atlantic Forest rodent capture records and geographically weighted models that allow us to test if predictors vary spatially. We also assessed the correspondence between proportions of hantavirus hosts in rodent communities and a human vulnerability to hantavirus infection index across the entire Atlantic Forest biome. We found that hantavirus host proportions were more positively influenced by landscape diversity than by a particular habitat or agricultural matrix type. Local small mammal diversity also positively influenced known pathogenic hantavirus host proportions, indicating that a plasticity to habitat quality may be more important for these hosts than competition with native forest dwelling species. We found a consistent positive effect of sugarcane and tree plantation on the proportion of rodent hosts, whereas defaunation intensity did not correlate with the proportion of hosts of potentially pathogenic hantavirus genotypes in the community, indicating that non-defaunated areas can also be hotspots for hantavirus disease outbreaks. The spatial match between host hotspots and human disease vulnerability was 17%, while coldspots matched 20%. Overall, we discovered strong spatial and land use change influences on hantavirus hosts at the landscape level across the Atlantic Forest. Our findings suggest disease surveillance must be reinforced in the southern and southeastern regions of the biome where the highest predicted hantavirus host proportion and levels of vulnerability spatially match. Importantly, our analyses suggest there may be more complex rodent community dynamics and interactions with human disease than currently hypothesized.
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Affiliation(s)
- Renata L. Muylaert
- Departamento de Ecologia, Universidade Estadual Paulista (UNESP), Rio Claro, Brazil
- Molecular Epidemiology and Public Health Laboratory, Infectious Disease Research Centre, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand
| | - Ricardo Siqueira Bovendorp
- Departamento de Ecologia, Universidade Estadual Paulista (UNESP), Rio Claro, Brazil
- PPG Ecologia e Conservação da Biodiversidade, LEAC, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
| | - Gilberto Sabino-Santos
- Center for Virology Research, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, United States of America
- Vitalant Research Institute, San Francisco, California, United States of America
| | - Paula R. Prist
- Instituto de Biociências, Departamento de Ecologia, Universidade de São Paulo (USP), São Paulo, SP, Brazil
| | - Geruza Leal Melo
- Programa de Pós-Graduação em Biodiversidade Animal, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | | | - David A. Wilkinson
- Molecular Epidemiology and Public Health Laboratory, Infectious Disease Research Centre, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand
| | - Milton Cezar Ribeiro
- Departamento de Ecologia, Universidade Estadual Paulista (UNESP), Rio Claro, Brazil
| | - David T. S. Hayman
- Molecular Epidemiology and Public Health Laboratory, Infectious Disease Research Centre, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand
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Voss RS, Díaz-Nieto JF, Jansa SA. A Revision ofPhilander(Marsupialia: Didelphidae), Part 1:P. quica,P. canus, and a New Species from Amazonia. AMERICAN MUSEUM NOVITATES 2018. [DOI: 10.1206/3891.1] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Robert S. Voss
- Division of Vertebrate Zoology (Mammalogy), American Museum of Natural History
| | - Juan F. Díaz-Nieto
- Departamento de Ciencias Biológicas and Grupo de Investigación BEC, Universidad EAFIT, Medellín, Colombia
| | - Sharon A. Jansa
- Department of Ecology, Evolution, and Behavior; and J.F. Bell Museum of Natural History, University of Minnesota, St. Paul, Minnesota
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Figueiredo AFA, Cordeiro DA, Nogueira JC, Talamoni SA, França LR, Costa GMJ. Spermatogenesis in a neotropical marsupial species, Philander frenatus (Olfers, 1818). Anim Reprod Sci 2017; 184:102-109. [PMID: 28732668 DOI: 10.1016/j.anireprosci.2017.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 07/04/2017] [Accepted: 07/10/2017] [Indexed: 11/26/2022]
Abstract
Despite the singular morphology of the male genital system and the different reproductive strategies of marsupials, little emphasis has been given to the testis morphology and spermatogenic kinetics in this mammalian order. The present study aimed to investigate the testis function and the duration of spermatogenesis in the southeastern four-eyed opossum, Philander frenatus. Testes of six adult males were routinely processed for histological and stereological analyses. In order to determine the duration of spermatogenesis, intratesticular injections of tritiated thymidine were performed 1h, 13days and 21days before the sacrifice. Based on the development of the acrosomic system, ten stages of the seminiferous epithelium cycle were characterized. The mean body and testis weights for the P. frenatus were respectively 326±20g and 0.4±0.05g, providing a gonadosomatic index of 0.3±0.02%. The most advanced germ cell types labeled at 1h, 13days and 21days after thymidine injections were, respectively, preleptotene spermatocytes at stage IV, pachytene spermatocytes at stage IV and diplotene spermatocytes at stage IX. Based on the stages frequencies and the most advanced labeled germ cells, each spermatogenic cycle and the entire spermatogenic process lasted respectively 13.5±0.5 and 60.9±2.4days. When compared to the vast majority of eutherian mammals already investigated, these data indicate that the Philander frenatus presents a relatively long duration of spermatogenesis.
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Affiliation(s)
- A F A Figueiredo
- Laboratory of Cellular Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - D A Cordeiro
- Pontifical Catholic University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - J C Nogueira
- Laboratory of Cellular Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - S A Talamoni
- Pontifical Catholic University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - L R França
- Laboratory of Cellular Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil; National Institute of Amazonian Research (INPA), Manaus, AM, Brazil
| | - G M J Costa
- Laboratory of Cellular Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
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Rocha CR, Ribeiro R, Marinho-Filho J. Influence of temporal variation and seasonality on population dynamics of three sympatric rodents. Mamm Biol 2017. [DOI: 10.1016/j.mambio.2017.01.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Prist PR, Uriarte M, Tambosi LR, Prado A, Pardini R, D´Andrea PS, Metzger JP. Landscape, Environmental and Social Predictors of Hantavirus Risk in São Paulo, Brazil. PLoS One 2016; 11:e0163459. [PMID: 27780250 PMCID: PMC5079598 DOI: 10.1371/journal.pone.0163459] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/08/2016] [Indexed: 11/18/2022] Open
Abstract
Hantavirus Pulmonary Syndrome (HPS) is a disease caused by Hantavirus, which are negative-sense RNA viruses in the family Bunyaviridae that are highly virulent to humans. Numerous factors modify risk of Hantavirus transmission and consequent HPS risk. Human-driven landscape change can foster transmission risk by increasing numbers of habitat generalist rodent species that serve as the principal reservoir host. Climate can also affect rodent population dynamics and Hantavirus survival, and a number of social factors can influence probability of HPS transmission to humans. Evaluating contributions of these factors to HPS risk may enable predictions of future outbreaks, and is critical to development of effective public health strategies. Here we rely on a Bayesian model to quantify associations between annual HPS incidence across the state of São Paulo, Brazil (1993–2012) and climate variables (annual precipitation, annual mean temperature), landscape structure metrics (proportion of native habitat cover, number of forest fragments, proportion of area planted with sugarcane), and social factors (number of men older than 14 years and Human Development Index). We built separate models for the main two biomes of the state (cerrado and Atlantic forest). In both biomes Hantavirus risk increased with proportion of land cultivated for sugarcane and HDI, but proportion of forest cover, annual mean temperature, and population at risk also showed positive relationships in the Atlantic forest. Our analysis provides the first evidence that social, landscape, and climate factors are associated with HPS incidence in the Neotropics. Our risk map can be used to support the adoption of preventive measures and optimize the allocation of resources to avoid disease propagation, especially in municipalities that show medium to high HPS risk (> 5% of risk), and aimed at sugarcane workers, minimizing the risk of future HPS outbreaks.
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Affiliation(s)
- Paula Ribeiro Prist
- Department of Ecology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
- * E-mail:
| | - Maria Uriarte
- Department of Ecology, Evolution & Environmental Biology, Columbia University, New York City, NY, United States of America
| | - Leandro Reverberi Tambosi
- Department of Ecology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
- Department of Ecology, Evolution & Environmental Biology, Columbia University, New York City, NY, United States of America
| | - Amanda Prado
- Department of Ecology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
| | - Renata Pardini
- Department of Zoology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
| | - Paulo Sérgio D´Andrea
- Department of Tropical Medicine, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, RJ, Brazil
| | - Jean Paul Metzger
- Department of Ecology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
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Lira MGS, Miranda GS, Rodrigues JGM, Nogueira RA, Gomes GCC, Cantanhêde LG, Silva-Souza N. ASPECTOS BIOLÓGICOS DE Holochilus sp., HOSPEDEIRO NATURAL DA ESQUISTOSSOMOSE. CIÊNCIA ANIMAL BRASILEIRA 2016. [DOI: 10.1590/1089-6891v17i137093] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Resumo Neste estudo objetivou-se analisar os aspectos reprodutivos (período estacional e quantidade de embriões) e a positividade para S. mansoni em roedores do gênero Holochilus, no município de São Bento - MA. Para isso, foram realizadas capturas mensais de até 10 roedores Holochilus sp., aleatoriamente quanto ao sexo, anotando-se o período estacional do município de São Bento nos meses de captura. Em laboratório, os roedores tiveram as fezes analisadas quanto à positividade para S. mansoni pelo método Kato-Katz. Após a análise, os animais foram anestesiados para a obtenção do comprimento total, peso corporal e determinação do sexo. Nas fêmeas, foi realizada a incisão da porção ventral do corpo, para a verificação da presença de embriões e contagem dos mesmos. Dentre os roedores capturados, ocorreu dominância de machos em quase todos os meses e eles tenderam a ser mais pesados e apresentaram maior porte que as fêmeas. Os animais mostraram elevado potencial reprodutivo. A positividade para S. mansoni e a reprodução dos Holochilus sp. foram maiores no período chuvoso de São Bento. Quanto ao número de embriões, constatou-se que, no período chuvoso, foram encontrados em maior quantidade por fêmea. Em suma, a intensa atividade reprodutiva juntamente à suscetibilidade para S. mansoni apresentada pelos roedores são fatores que ajudam na manutenção e agravam a esquistossomose na Baixada Maranhense.
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Lima DO, Pinho GM, Fernandez FAS. Spatial patterns of the semi-aquatic rodent Nectomys squamipesin Atlantic forest streams. J NAT HIST 2015. [DOI: 10.1080/00222933.2015.1059516] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Barros CS, Püttker T, Pardini R. Timing and environmental cues associated with triggering of reproductive activity in Atlantic forest marsupials. Mamm Biol 2015. [DOI: 10.1016/j.mambio.2014.07.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Rocha RG, Ferreira E, Martins ICM, Costa LP, Fonseca C. Seasonally flooded stepping stones: emerging diversity of small mammal assemblage in the Amazonia-Cerrado ecotone, central Brazil. Zool Stud 2014. [DOI: 10.1186/s40555-014-0060-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Teixeira BR, Loureiro N, Strecht L, Gentile R, Oliveira RC, Guterres A, Fernandes J, Mattos LHBV, Raboni SM, Rubio G, Bonvicino CR, dos Santos CND, Lemos ERS, D'Andrea PS. Population ecology of hantavirus rodent hosts in southern Brazil. Am J Trop Med Hyg 2014; 91:249-57. [PMID: 24935954 DOI: 10.4269/ajtmh.13-0465] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
In this study we analyze population dynamics of hantavirus rodent hosts and prevalence of infection over a 2-year period in Southern Brazil, a region with a high incidence of hantavirus pulmonary syndrome. The 14 small mammal species captured were composed of 10 rodents and four marsupials, the six most abundant species being Akodon serrensis, Oxymycterus judex, Akodon montensis, Akodon paranaensis, Oligoryzomys nigripes, and Thaptomys nigrita. These species displayed a similar pattern with increasing population sizes in fall/winter caused by recruitment and both, increase in reproductive activity and higher hantavirus prevalence in spring/summer. Specific associations between A. montensis/Jaborá Virus (JABV) and O. nigripes/Juquitiba-like Virus (JUQV-like) and spillover infections between A. paranaensis/JABV, A. serrensis/JABV, and A. paranaensis/JUQV-like were observed. Spillover infection in secondary hosts seems to play an important role in maintaining JABV and JUQV-like in the hantavirus sylvatic cycle mainly during periods of low prevalence in primary hosts.
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Affiliation(s)
- Bernardo R Teixeira
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Nathalie Loureiro
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Liana Strecht
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Rosana Gentile
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Renata C Oliveira
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Alexandro Guterres
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Jorlan Fernandes
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Luciana H B V Mattos
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Sonia M Raboni
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Giselia Rubio
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Cibele R Bonvicino
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Claudia N Duarte dos Santos
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Elba R S Lemos
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
| | - Paulo S D'Andrea
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Laboratório de Hantaviroses e Rickettsioses, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, Brazil; Instituto Carlos Chagas, FIOCRUZ, Paraná, Brazil; Secretaria de Saúde do Estado do Paraná, Paraná, Brazil; Divisão de Genética, Instituto Nacional de Câncer, Rio de Janeiro, Brazil
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Costa-Silva M, Barros LDA, Garcia JS, Neves RH, Rodrigues-Silva R, Machado-Silva JR, Maldonado-Júnior A. Susceptibility of a Brazilian wild rodent isolate of Schistosoma mansoni to praziquantel in mice. Exp Parasitol 2012; 130:394-9. [PMID: 22343042 DOI: 10.1016/j.exppara.2012.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 01/31/2012] [Accepted: 02/02/2012] [Indexed: 10/14/2022]
Abstract
The therapeutic effects of praziquantel (PZQ) against a Schistosoma mansoni isolate derived from Nectomys squamipes (isolate R) and a susceptible isolate (BH) were analyzed in Swiss mice by fecal egg counting, adult worm reduction and oogram pattern. Infected mice were orally administrated with 62.5mg/kg (group 1), 125mg/kg (group 2), 250mg/kg (group 3) and 500mg/kg (group 4), each dose divided over 3 days (49, 50 and 51 days after infection). The data were analyzed using one-way analysis of variance (ANOVA). In regard to isolate R, no fecal eggs were observed with 250 mg/Kg and 500 mg/kg (p<0.05), whereas BH excretion reached zero with all doses. Mean worm burden reduction was significantly (p<0.05) higher at the two highest concentrations, regardless of isolate. At 62.5mg/kg, the percentage of immature eggs varied from 17% (isolate R) to 38% (isolate BH). At 125 mg/kg, the percentage of immature eggs varied from 20% (isolate R) to 16% (isolate BH). At 250 mg/kg, immature eggs dropped significantly to 1% (isolate R) and 4% (isolate BH). At 500 mg/kg, no immature eggs were found in isolate R, whereas in BH was 8%. No dosage significantly (p>0.05) affected the percentage of mature eggs, regardless of isolate. There was a large increase (p<0.001) in the percentages of dead eggs in all treated groups of 62% and 64% in groups 3 and 4, respectively (isolate R). The percentage of dead eggs rose from 34% (group 1) to 58% (group 3) in isolate BH. Although group 4 showed lowest increase in the percentage of dead eggs (46%), it was higher (p<0.001) compared to the 8% in the control. Our findings indicate that the wild isolate from N. squamipes is susceptible to PZQ.
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Affiliation(s)
- Michele Costa-Silva
- Laboratory of Biology and Parasitology of Wild Mammal Reservoirs, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Av. Brasil 4365, Manguinhos, 21045-900 Rio de Janeiro, Brazil
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Massawe AW, Mulungu LS, Makundi RH, Dlamini N, Eiseb SJ, Kirsten F, Mahlaba T, Malebane P, Maltitz EV, Monadjem A, Taylor P, Tutjavi V, Belmain SR. Spatial and Temporal Population Dynamics of Rodents in Three Geographically Different Regions in Africa: Implication for Ecologically-Based Rodent Management†. AFRICAN ZOOLOGY 2011. [DOI: 10.3377/004.046.0219] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Perez Carusi LC, Farace MI, Ribicich MM, Gómez Villafañe IE. Reproduction and parasitology of Didelphis albiventris (Didelphimorphia) in an agroecosystem landscape in central Argentina. MAMMALIA 2009. [DOI: 10.1515/mamm.2009.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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