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Low Prevalence of Enzootic Equine Influenza Virus among Horses in Mongolia

1
Institute of Veterinary Medicine, Mongolian University of Life Sciences, Ulaanbaatar 17024, Mongolia
2
Division of Infectious Diseases, and Global Health Institute, Duke University, Durham, NC 27708, USA
3
National Center for Zoonotic Diseases, Ulaanbaatar 18131, Mongolia
4
Global Health Research Center, Duke-Kunshan University, Kunshan 215316, China
5
Program in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
*
Author to whom correspondence should be addressed.
Pathogens 2017, 6(4), 61; https://doi.org/10.3390/pathogens6040061
Received: 4 October 2017 / Revised: 28 November 2017 / Accepted: 28 November 2017 / Published: 30 November 2017
Horses are critically important for Mongolian herders’ livelihoods, providing transportation and food products, and playing important cultural roles. Equine influenza virus (EIV) epizootics have been frequent among Mongolia’s horses, with five occurring since 1970. We sought to estimate the prevalence for EIV infection among horses and Bactrian camels with influenza-like illness between national epizootics. In 2016–2017, active surveillance for EIV was periodically performed in four aimags (provinces). Nasal swabs were collected from 680 horses and 131 camels. Seven of the horse swabs were “positive” for qRT-PCR evidence of influenza A (Ct value ≤ 38). Two more were “suspect positive” (Ct value > 38 and ≤ 40). These nine specimens were collected from four aimags. None of the camel specimens had molecular evidence of infection. Despite serial blind passage in Madin-Darby Canine Kidney cells (MDCK) cells, none of the nine horse specimens yielded an influenza A virus. None of the 131 herder households surveyed had recently vaccinated their horses against EIV. It seems likely that sporadic EIV is enzootic in multiple Mongolian aimags. This finding, the infrequent use of EIV vaccination, periodic prevalence of highly pathogenic avian influenza, and the mixing of domestic and wild equid herds suggest that Mongolia may be a hot spot for novel EIV emergence. View Full-Text
Keywords: Bactrian camels; equine influenza; Mongolia; pastoralism Bactrian camels; equine influenza; Mongolia; pastoralism
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Sack, A.; Daramragchaa, U.; Chuluunbaatar, M.; Gonchigoo, B.; Bazartseren, B.; Tsogbadrakh, N.; Gray, G.C. Low Prevalence of Enzootic Equine Influenza Virus among Horses in Mongolia. Pathogens 2017, 6, 61.

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