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Seroprevalence of Selected Zoonotic Viruses in Rodents and Humans

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Seroprevalence of Selected Zoonotic Viruses in Rodents and Humans VECTOR-BORNE AND ZOONOTIC DISEASES Volume 15, Number 1, 2015 ª Mary Ann Liebert, Inc. DOI: 10.1089/vbz.2014.1603 Rodents and Risk in the Mekong Delta of Vietnam: Seroprevalence of Selected Zoonotic Viruses in Rodents and Humans Nguyen Van Cuong,1 Juan Carrique-Mas,1 Hien Vo Be,2 Nguyen Ngoc An,3 Ngo Tri Tue,1 Nguyet Lam Anh,1 Pham Hong Anh,1 Nguyen The Phuc,1 Stephen Baker,1 Liina Voutilainen,4 Anne Ja¨a¨skela¨inen,5,6 Eili Huhtamo,5 Mira Utriainen,5 Tarja Sironen,5 Antti Vaheri,5,6 Heikki Henttonen,4 Olli Vapalahti,5–7 Yannick Chaval,8 Serge Morand,8 and Juliet E. Bryant1,9 Abstract In the Mekong Delta in southern Vietnam, rats are commonly traded in wet markets and sold live for food consumption. We investigated seroprevalence to selected groups of rodent-borne viruses among human pop- ulations with high levels of animal exposure and among co-located rodent populations. The indirect fluores- cence antibody test (IFAT) was used to determine seropositivity to representative reference strains of hantaviruses (Dobrava virus [DOBV], Seoul virus [SEOV]), cowpox virus, arenaviruses (lymphocytic chor- iomeningitis virus [LCMV]), flaviviruses (tick-borne encephalitis virus [TBEV]), and rodent parechoviruses (Ljungan virus), using sera from 245 humans living in Dong Thap Province and 275 rodents representing the five common rodent species sold in wet markets and present in peridomestic and farm settings. Combined seropositivity to DOBV and SEOV among the rodents and humans was 6.9% (19/275) and 3.7% (9/245), respectively; 1.1% (3/275) and 4.5% (11/245) to cowpox virus; 5.4% (15/275) and 47.3% (116/245) for TBEV; and exposure to Ljungan virus was 18.8% (46/245) in humans, but 0% in rodents. Very little seroreactivity was observed to LCMV in either rodents (1/275, 0.4%) or humans (2/245, 0.8%). Molecular screening of rodent liver tissues using consensus primers for flaviviruses did not yield any amplicons, whereas molecular screening of rodent lung tissues for hantavirus yielded one hantavirus sequence (SEOV). In summary, these results indicate low to moderate levels of endemic hantavirus circulation, possible circulation of a flavivirus in rodent reservoirs, and the first available data on human exposures to parechoviruses in Vietnam. Although the current evidence suggests only limited exposure of humans to known rodent-borne diseases, further research is war- ranted to assess public health implications of the rodent trade. Key Words: Vietnam—Rodents—Flavivirus—Hantavirus—Cowpox virus–Arenavirus—Ljungan virus. Introduction (Khiem et al. 2003). Rat infestations in rice fields cause enormous crop damage, and trapping provides a means of n the Mekong Delta of Vietnam, rats are commonly pest control as well as augmenting local dietary sources of Itrapped in rice fields before and after harvesting and animal protein. Rodent parts (heads, tails, and innards) are sold live for food consumption. The rat trade is vigorous, also often fed to domestic livestock or reptiles reared in ca- involving up to 3300–3600 tonnes of meat sold per year pitivity (frogs, snakes, crocodiles). Rodents are well-recognized 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam. 2Sub-Department of Animal Health and 3Department of Preventive Medicine, Dong Thap Province, Cao Lanh, Vietnam. 4Finnish Forest Research Institute, Vantaa, Finland. 5Haartman Institute, University of Helsinki, Helsinki, Finland. 6HUSLAB, Department of Virology and Immunology, Helsinki University Central Hospital, Helsinki, Finland. 7Faculty of Veterinary Medicine, Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland. 8Universite´ Montpellier, Montpellier, France. 9Nuffield Department of Medicine, Oxford University, Oxford, United Kingdom. 65 66 CUONG ET AL. vectors of a range of zoonotic viruses transmitted via close technique by a study nurse. After collection, all specimens contact with saliva, urine, or feces (Meerburg 2010). were aliquotted and preserved at - 80°C. Information was Given the frequency and intensity of human and livestock collected on sociodemographic factors, occupation, house contact with rodents, we aimed to explore potential risks structure, hygiene, water source, food consumption, house- associated with these exposures through seroprevelance hold animals, detailed animal contact histories, vaccination, studies. We determined seroprevalence to five groups of and admission to hospital in the 12 months prior to the survey. known zoonotic viruses in rodents representing the common species sold in wet markets and present in peridomestic and Serological screening farm settings. In parallel, we determined seroprevalence to the same set of viruses in a cohort of individuals with high Human and rodent sera, and rodent dried blood spots on levels of occupational and residential exposure to rodents and filter papers were screened using an indirect immunofluo- domestic livestock. The viruses of interest (namely flavi- rescence antibody test (IFAT) for antibodies against Seoul viruses, hantaviruses, poxviruses, arenaviruses, and rodent (SEOV) and Dobrava (DOBV) hantaviruses (representatives parechoviruses) were selected on the basis of their known of rat and mouse type host lineages, respectively); flavi- or probable endemicity, their documented associations with viruses (tick-borne encephalitis [TBEV] serocomplex); are- rodent-borne disease, and considerations of feasibility and naviruses (lymphocytic choriomeningitis virus [LCMV]); resources (i.e., access to reference strains and well-established poxviruses (cowpox virus); and parechoviruses (Ljungan diagnostic protocols). In addition to serological screening, virus). IFAT spotslides and the assay procedures were con- we tested rodent liver and lung tissues by RT-PCR using ducted as previously described (Kallio-Kokko et al. 2006, generic primers for flaviviruses and hantaviruses). Ja¨a¨skela¨inen et al. 2013) using Vero E6 cells for SEOV, DOBV, TBEV, LCMV, and Vero cells for cowpox and Methods Ljungan viruses. Viral reference strains were 80-39 for SEOV (Antic et al. 1991), Ano-Poroia for DOBV (Nemirov Rodents et al. 1999), Armstrong for LCMV (Kallio-Kokko et al. Rodent surveys were conducted as described by Hoang 2006), Kumlinge A52 for TBEV (Brummer-Korvenkontio et al. (2014). Briefly, rats were purchased from markets in et al. 1973; Whitby et al. 1993), CPXV/FIN/T2000 for five provinces of the Mekong Delta (Dong Thap, Tien Giang, cowpox virus (Pelkonen et al. 2003), and LV 145 SLG for An Giang, Vinh Long, and Can Tho) during October of 2012, Ljungan (Tolf et al. 2009). Sera were diluted 1:20 in phos- and field trapping was conducted in peridomestic and forest phate-buffered saline (PBS) for initial screening, and repeat habitats in Dong Thap province during March of 2013. testing with three-fold serial dilutions was performed on all human putative seropositives. Whole blood collected in filter Specimens used in this investigation comprised sera or whole 2 blood and tissues from 275 individual rats (150 purchased papers was eluted in PBS (*1cm of filter paper in 1 mL of in wet markets, 125 field trapped). Five rodent species were PBS). For rodent sera, the secondary antibody was polyclonal represented: Rattus argentiventer (n = 104) Bandicota indica rabbit anti-mouse fluorescein isothiocyanate (FITC) conju- (n = 65), R. tanezumi (n = 61), R. norvegicus (n = 29), and gate diluted 1:30 (Dako A/S, Copenhagen, Denmark); for R. exulans (n = 16) (Table 1). human sera, the secondary antibody was anti-human immu- noglobulin G (IgG) FITC conjugate diluted 1:100 (Jackson Human sera and data collection Immuno Research Laboratories, West Grove, PA). Each slide was examined independently by two researchers using an Sera were obtained from a cohort of 245 people living in Olympus BX51 microscope. Human sera with evidence of farming communities in Dong Thap Province. Ethical ap- TBEV reactivity were further examined using differential proval was obtained by the Oxford Tropical Research Ethics IFAT screening in parallel for dengue (DENV) and Japanese Committee and the People’s Committee of Dong Thap Pro- encephalitis virus (JEV), as previously described (Tonteri vince, and the study was implemented by the provincial et al. 2011). Preventive Medicine Center (PMC). Participants were eligi- ble if they gave informed consent and were involved in Molecular screening raising, slaughtering, or processing livestock or wildlife, with a minimum of 10 h exposure per week. Family members with Virological screening for flaviviruses and hantaviruses residential exposures to livestock were also recruited (mini- was performed on all rodent liver and lung samples. Briefly, mum 1 year of age). Phlebotomy was performed using sterile 1-cm2 tissue samples were homogenized using a bead mill Table 1. Rodent Species Purchased and Trapped in the Mekong Delta, November, 2012, to March, 2013 Rattus Bandicota Rattus Rattus Rattus argentiventer indica tanezumi norvegicus exulans Total All 104 65 61 29 16 275 Male/female 52/52 19/46 43/18 15/14 9/7 138/137 No. purchased rats 88 44 9 9 0 150 Total rodents trapped 16 21 52 20 16 125 No. trapped in farms 14 10 19 18 15 76 No. trapped in forest/fields 2 11 33 2 1 49 RODENT-BORNE VIRUSES IN VIETNAM 67 (TissueLyser II, QIAGEN), and nucleic acid extracted using Overall seropositivity to hantaviruses was 6.9% (19/275). MagNA Pure 96 Viral NA Small Volume Kit (Roche) on an In spite of the supposed cross-reactivity among murine automated extractor (Roche). Following extraction, nucleic hantaviruses, only three individuals were positive for both acid samples were pooled by species (five samples per pool). hantaviral antigens (six positive for DOBV only, 10 positive cDNA from lung samples was screened for hantavirus with for SEOV only). This differential reactivity may indicate the conventional PCR (L segment) (Klempa et al. 2006). cDNA presence of several hantaviruses. Seropositive host species from liver tissues was screened for flaviviruses using con- included R. norvegicus, R. argentiventer, R. tanezumi, and B. sensus NS5 primers (Kuno et al. 1998). When pools tested indica. None of the R.
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