Tropical Animal Health and Production

, Volume 37, Issue 6, pp 443–449 | Cite as

Annual Variations in Leptospira Seroprevalence among Sows in Southern Vietnam

  • S. Boqvist
  • V. T. Ho Thi
  • U. Magnusson


A serological survey was conducted among sows in the Mekong delta in southern Vietnam in 1999 to investigate variations in leptospiral Seroprevalence over a one-year period. In this region, leptospirosis is endemic and a high leptospiral Seroprevalence has been shown in the pig population. In this study, the serology of six Leptospira serovars was analysed by the microscopic agglutination test for 429 sows at five large-scale state farms sampled during the dry period, the rainy period and the early dry period. The serovars included were L. interrogans serovar (sv) autumnalis strain Akiyama A, L. interrogans sv bratislava strain Jez, L. interrogans sv icterohaemorrhagiae strain Kantorowicz, L. interrogans sv pomona strain Pomona, L. borgpetersenii sv tarassovi strain Perepelitsin, and L. kirschneri sv grippotyphosa strain Duyster. Variations in Seroprevalence over the year were found for sv bratislava and sv icterohaemorrhagiae: the Seroprevalence was higher during the dry period compared with the rainy period (p = 0.07 and p = 0.005, respectively) and the early dry period (p = 0.00006 and p = 0.0006, respectively). It is concluded that in regions where water is constantly abundant and where animals are exposed to the outdoor environment all year round there are highly significant variations in leptospiral Seroprevalence over the year.


Leptospira pig seasonal variation serology Vietnam 



microscopic agglutination test




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  1. Boqvist, S., Chau, B.L., Gunnarsson, A., Olsson Engvall, E., Vågsholm, I. and Magnusson, U., 2002a. Animal- and herd-level risk factors for leptospiral seropositivity among sows in the Mekong delta, Vietnam. Preventive Veterinary Medicine, 53, 233–245CrossRefGoogle Scholar
  2. Boqvist, S., Ho Thi, V.T., Vågsholm, I. and Magnusson, U., 2002b. The impact of Leptospira seropositivity on the reproductive performance in sows in southern Vietnam. Theriogenology, 58, 1327–1335CrossRefGoogle Scholar
  3. Chau, B.L., Vo, VS. and Chi, S.T., 1996. Research priorities for improving animal production in the Mekong Delta of Vietnam. In: W.J. Pryor (ed.), Exploring Approaches to Research in the Animal Sciences in Vietnam: A Workshop Held in the City of Hue, Vietnam, 31 July-3 August, 1995. ACIAR Prodeedings No. 68, (Pirie Printers Pty Ltd, Canberra), 213–216Google Scholar
  4. Elder, J.K., McKeon, G.M., Duncalfe, R, Ward, W.H. and Leutton, R.D., 1986. Epidemiological studies on the ecology of Leptospira interrogans serovars pomona and hardjo in Queensland. Preventive Veterinary Medicine, 3, 501–521CrossRefGoogle Scholar
  5. Ellis, W.A., 1999. Leptospirosis. In: B.E. Straw, S. D'Allaire, W.L. Mengeling and D.J. Taylor (eds.), Diseases of Swine, 8 edn, (Iowa State University Press, Ames, IA), 483–493Google Scholar
  6. Faine, S., 1982. Guidelines for the Control of Leptospirosis, (World Health Organization, Geneva)Google Scholar
  7. Faine, S., Adler, B., Bolin, C.A. and Perolat, P., 1999. Leptospira and Leptospirosis, (Medi Sci., Melbourne)Google Scholar
  8. Hai, L.T. and Nguyen, N.H., 1997. Outlines of pig production in Vietnam. Pig News and Information, 18, 91–94Google Scholar
  9. Hathaway, S.C., Little, T.W. and Pritchard, D.G., 1986. Problems associated with the serological diagnosis of Leptospira interrogans serovar hardjo infection in bovine populations. Veterinary Record, 119, 84–86PubMedGoogle Scholar
  10. Little, T.W., Richards, M.S., Hussaini, S.N. and Jones, T.D., 1980. The significance of leptospiral antibodies in calving and aborting cattle in south west England. Veterinary Record, 106, 221–224PubMedGoogle Scholar
  11. Miller, D.A., Wilson, M.A. and Beran, G.W., 1991. Relationships between prevalence of Leptospira interrogans in cattle, and regional, climatic, and seasonal factors. American Journal of Veterinary Research, 52, 1766–1768PubMedGoogle Scholar
  12. Prescott, J.F. and Zuerner, R.L., 1993. Leptospira. In: Gyles, C.L. and Thoen, CO. (eds), Pathogenesis of Bacterial Infections in Animals, 2nd edn, (Iowa State University Press, Ames, IA). 287–296Google Scholar
  13. Pritchard, D.G., Little, T.W., Wrathall, A.E. and Jones, P., 1985. Epidemiology of leptospirosis in relation to reproductive disease in pigs. Pig Veterinary Society Proceedings, 12, 65–82Google Scholar

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Department of Obstetrics and Gynaecology, Centre of Reproductive Biology in Uppsala (CRU)Swedish University of Agricultural SciencesUppsalaSweden
  2. 2.Faculty of Animal Husbandry and Veterinary MedicineCan Tho UniversityCan ThoVietnam
  3. 3.Department of Disease ControlNational Veterinary Institute, Swedish Zoonosis CentreUppsalaSweden

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