Estimates of the annual incidence density and financial losses of equine monocytic ehrlichiosis in New York state

Edward R Atwill, Hussni O. Mohammed

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Very little is known about the incidence density of equine monocytic ehrlichiosis (EME) in New York state. Obtaining a valid estimate of the state-wide incidence density would provide a measure for how common EME is in the New York state equine population, provide a historical benchmark of the incidence density for future comparisons, and aid in the estimation of the financial losses associated with EME. In this study we used four sets of state-wide data to obtain four estimates of the annual incidence density of EME in New York state. Two methods were used to calculate the incidence density: the average incidence rate of EME over a period of time, and transforming the point prevalence of exposure to Ehrlichia risticii into an incidence density. Given the incidence density, an estimate of the annual state-wide financial losses associated with this disease was calculated. Three of the four estimated ranges of the incidence density fell within the range of 0.44-1.73 per 1000 horse-years at risk. Therefore, given that there were approximately 182 000 horses in New York state in 1988, among which 92.7% (168 714) were susceptible at one time, we would expect 74-292 cases of EME per year under steady-state conditions. Since the mean cost (direct and indirect) associated with a case of EME in New York state was estimated at $1030.00, the annual state-wide financial losses associated with clinical EME for equine owners was $76 220-300 760.

Original languageEnglish (US)
Pages (from-to)41-51
Number of pages11
JournalPreventive Veterinary Medicine
Volume23
Issue number1-2
DOIs
StatePublished - 1995
Externally publishedYes

Keywords

  • Equine monocytic ehrlichiosis
  • Financial losses
  • Incidence density

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Animals

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