The prevalence of equine leptospirosis in New York State

Rachel S. Barwick, Hussni O. Mohammed, Edward R Atwill, Patrick L. Mcdonough, Maurice E. White

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We carried out a cross-sectional study to determine the seroprevalence of seven different serovars of Leptospira interrogans in horses in New York State and examine the geographic distribution of the disease in the state. A random sample of 2,967 horses was selected from the equine population in New York State using the 1988 New York State Equine Census as a sampling frame. The samples were tested for the presence of antibodies against seven serovars: L. pomona, L. hardjo, L. icterohaemorrhagiae, L. grippotyphosa, L. canicola, L. autumnalis, and L. bratislava. The microscopic agglutination test was used to determine seropositivity at a range of dilutions from 1:100 to 1:12800. A tiler of ≥ 100 was considered positive. We also examined the association between seroconversion at higher (≥ 1600) liters among those serovars. Cluster analysis was used to examine the distribution of the disease for special pattern or clustering. The following prevalences were determined: L. pomona (7.6%), L. hardjo (1.0%), L. icterohaemorrhagiae (11.3%), L. grippotyphosa (6.5%), L. canicola (16.2%), L. autumnalis (35.1%), and L. bratislava (40.7%). The majority of the titers for all serovars were relatively low. Most of the samples tested positive for L. pomona had titers ranging from 100 to 400. For all the other serovars, most samples tested positive had titers ranging from 100 to 200. We found significant associations of seroconversion between all pairs of serovars except L. grippotyphosa and L. pomona, and L. grippotyphosa and L. autumnalis.

Original languageEnglish (US)
Pages (from-to)119-124
Number of pages6
JournalJournal of Equine Science
Volume9
Issue number4
StatePublished - 1998
Externally publishedYes

Fingerprint

Leptospirosis
leptospirosis
Horses
serotypes
horses
seroconversion
seroprevalence
Cluster Analysis
sampling
Leptospira interrogans
Agglutination Tests
Seroepidemiologic Studies
agglutination tests
Censuses
cross-sectional studies
Serogroup
cluster analysis
geographical distribution
Cross-Sectional Studies
antibodies

Keywords

  • Epidemiology
  • Equine
  • Leptospirosis
  • Prevalence

ASJC Scopus subject areas

  • Equine

Cite this

Barwick, R. S., Mohammed, H. O., Atwill, E. R., Mcdonough, P. L., & White, M. E. (1998). The prevalence of equine leptospirosis in New York State. Journal of Equine Science, 9(4), 119-124.

The prevalence of equine leptospirosis in New York State. / Barwick, Rachel S.; Mohammed, Hussni O.; Atwill, Edward R; Mcdonough, Patrick L.; White, Maurice E.

In: Journal of Equine Science, Vol. 9, No. 4, 1998, p. 119-124.

Research output: Contribution to journalArticle

Barwick, RS, Mohammed, HO, Atwill, ER, Mcdonough, PL & White, ME 1998, 'The prevalence of equine leptospirosis in New York State', Journal of Equine Science, vol. 9, no. 4, pp. 119-124.
Barwick RS, Mohammed HO, Atwill ER, Mcdonough PL, White ME. The prevalence of equine leptospirosis in New York State. Journal of Equine Science. 1998;9(4):119-124.
Barwick, Rachel S. ; Mohammed, Hussni O. ; Atwill, Edward R ; Mcdonough, Patrick L. ; White, Maurice E. / The prevalence of equine leptospirosis in New York State. In: Journal of Equine Science. 1998 ; Vol. 9, No. 4. pp. 119-124.
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AB - We carried out a cross-sectional study to determine the seroprevalence of seven different serovars of Leptospira interrogans in horses in New York State and examine the geographic distribution of the disease in the state. A random sample of 2,967 horses was selected from the equine population in New York State using the 1988 New York State Equine Census as a sampling frame. The samples were tested for the presence of antibodies against seven serovars: L. pomona, L. hardjo, L. icterohaemorrhagiae, L. grippotyphosa, L. canicola, L. autumnalis, and L. bratislava. The microscopic agglutination test was used to determine seropositivity at a range of dilutions from 1:100 to 1:12800. A tiler of ≥ 100 was considered positive. We also examined the association between seroconversion at higher (≥ 1600) liters among those serovars. Cluster analysis was used to examine the distribution of the disease for special pattern or clustering. The following prevalences were determined: L. pomona (7.6%), L. hardjo (1.0%), L. icterohaemorrhagiae (11.3%), L. grippotyphosa (6.5%), L. canicola (16.2%), L. autumnalis (35.1%), and L. bratislava (40.7%). The majority of the titers for all serovars were relatively low. Most of the samples tested positive for L. pomona had titers ranging from 100 to 400. For all the other serovars, most samples tested positive had titers ranging from 100 to 200. We found significant associations of seroconversion between all pairs of serovars except L. grippotyphosa and L. pomona, and L. grippotyphosa and L. autumnalis.

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