Retrospective evaluation of factors associated with the risk of seropositivity to Ehrlichia risticii in horses in New York State.

Edward R Atwill, H. O. Mohammed, E. Dubovi, J. Lopez

Research output: Contribution to journalArticle

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Abstract

A retrospective study was designed to determine the distribution of equine monocytic ehrlichiosis among the equine population in New York state, and to identify factors associated with risk of disease. Serum samples submitted to the diagnostic laboratory of the university during the period from January 1985 through December 1986 were examined for antibodies to Ehrlichia risticii, using the indirect fluorescent antibody technique. Factors evaluated included geographic origin and date of submission of the sample, and age, breed, and sex of the horse. Logistic regression analysis was used to identify which factors were significantly associated with the risk of seropositivity to E risticii, while simultaneously controlling for other factors. Of the 2,579 tested samples, 1,950 (76%) had positive results. Factors significantly associated with risk of seropositivity to E risticii were: breed of the horse (Thoroughbreds were 3 times more likely to have been exposed to E risticii, compared with non-Standardbred, non-Thoroughbred breeds); sex (female horses were 2.7 times more likely to have been exposed, compared with male horses); age of the horse (the risk of being exposed to E risticii increased with age, peaked at around 12 years, and decreased thereafter); and month of submission (horses tested during November and December had the highest odds of being seropositive [odds ratio = 2.1], and horses tested during March through April were least likely to be seropositive [odds ratio = 0.5], compared with horses tested during January and February).

Original languageEnglish (US)
Pages (from-to)1931-1934
Number of pages4
JournalAmerican Journal of Veterinary Research
Volume53
Issue number10
StatePublished - Oct 1992
Externally publishedYes

Fingerprint

Neorickettsia risticii
seroprevalence
Horses
horses
odds ratio
Potomac horse fever
breeds
horse breeds
Odds Ratio
gender
Ehrlichiosis
retrospective studies
sampling
provenance
fluorescent antibody technique
Indirect Fluorescent Antibody Technique
regression analysis

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Retrospective evaluation of factors associated with the risk of seropositivity to Ehrlichia risticii in horses in New York State. / Atwill, Edward R; Mohammed, H. O.; Dubovi, E.; Lopez, J.

In: American Journal of Veterinary Research, Vol. 53, No. 10, 10.1992, p. 1931-1934.

Research output: Contribution to journalArticle

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