Evaluation of factors associated with positive IgM capture ELISA results in equids with clinical signs compatible with Nile virus infection

1,017 Cases (2003)

Jennifer M. Tanner, Josie L. Traub-Dargatz, Ashley E Hill, Hana Van Campen, Anthony P. Knight, Wayne E. Cunningham, M. D. Salman

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Objective - To describe the prevalence of West Nile virus (WNV) infection and evaluate factors associated with positive IgM capture ELISA results in equids with clinical signs compatible with WNV infection. Design - Retrospective case series. Sample Population - Laboratory submission forms from 1,104 equids tested for WNV in Colorado in 2003. Procedures - Submission forms accompanying samples submitted for detection of WNV via IgM capture ELISA were obtained from the Colorado state veterinarian and diagnostic laboratories performing the tests. Data on signalment, clinical signs, history of vaccination against WNV and assay results were collected from laboratory submission forms. Equids with clinical signs compatible with WNV infection in which IgM capture ELISA results were positive were considered as case equids. Results - 1,104 equids were tested for WNV; 1,017 (92.1%) had clinical signs compatible with WNV infection. Among equids with clinical signs compatible with WNV infection, the odds of testing positive for WNV via IgM capture ELISA were lower in males and in vaccinated equids and higher in equids with moderate and severe illness, compared with females, unvaccinated equids, and equids with mild illness. Conclusions and Clinical Relevance - Among equids with clinical signs compatible with WNV infection, vaccination against WNV, severity of clinical signs, duration of illness, and region in Colorado were associated with increased risk of having a positive IgM capture ELISA result.

Original languageEnglish (US)
Pages (from-to)414-421
Number of pages8
JournalJournal of the American Veterinary Medical Association
Volume228
Issue number3
DOIs
StatePublished - Feb 1 2006
Externally publishedYes

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West Nile virus
Virus Diseases
Immunoglobulin M
Enzyme-Linked Immunosorbent Assay
enzyme-linked immunosorbent assay
viruses
infection
Vaccination
vaccination
Veterinarians
veterinarians

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Evaluation of factors associated with positive IgM capture ELISA results in equids with clinical signs compatible with Nile virus infection : 1,017 Cases (2003). / Tanner, Jennifer M.; Traub-Dargatz, Josie L.; Hill, Ashley E; Van Campen, Hana; Knight, Anthony P.; Cunningham, Wayne E.; Salman, M. D.

In: Journal of the American Veterinary Medical Association, Vol. 228, No. 3, 01.02.2006, p. 414-421.

Research output: Contribution to journalArticle

Tanner, Jennifer M. ; Traub-Dargatz, Josie L. ; Hill, Ashley E ; Van Campen, Hana ; Knight, Anthony P. ; Cunningham, Wayne E. ; Salman, M. D. / Evaluation of factors associated with positive IgM capture ELISA results in equids with clinical signs compatible with Nile virus infection : 1,017 Cases (2003). In: Journal of the American Veterinary Medical Association. 2006 ; Vol. 228, No. 3. pp. 414-421.
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abstract = "Objective - To describe the prevalence of West Nile virus (WNV) infection and evaluate factors associated with positive IgM capture ELISA results in equids with clinical signs compatible with WNV infection. Design - Retrospective case series. Sample Population - Laboratory submission forms from 1,104 equids tested for WNV in Colorado in 2003. Procedures - Submission forms accompanying samples submitted for detection of WNV via IgM capture ELISA were obtained from the Colorado state veterinarian and diagnostic laboratories performing the tests. Data on signalment, clinical signs, history of vaccination against WNV and assay results were collected from laboratory submission forms. Equids with clinical signs compatible with WNV infection in which IgM capture ELISA results were positive were considered as case equids. Results - 1,104 equids were tested for WNV; 1,017 (92.1{\%}) had clinical signs compatible with WNV infection. Among equids with clinical signs compatible with WNV infection, the odds of testing positive for WNV via IgM capture ELISA were lower in males and in vaccinated equids and higher in equids with moderate and severe illness, compared with females, unvaccinated equids, and equids with mild illness. Conclusions and Clinical Relevance - Among equids with clinical signs compatible with WNV infection, vaccination against WNV, severity of clinical signs, duration of illness, and region in Colorado were associated with increased risk of having a positive IgM capture ELISA result.",
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