May 2005
Volume 46, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2005
The Influence of Rainfall and Temperature on the Frequency of Equine Fungal Keratitis
Author Affiliations & Notes
  • P.A. Moore
    Department of Small Animal Medicine Surgery, College Veterinary MedicineUniversity of Georgia, Athens, GA
  • U.M. Dietrich
    Deptartment Small Animal Medicine and Surgery,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • M.H. Barton
    Department of Large Animal Medicine,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • C.B. Mosunic
    Department of Small Animal Medicine Surgery,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • M.J. Chandler
    Department of Small Animal Medicine Surgery,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • K.P. Carmichael
    Department of Pathology,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • D.E. Stooksbury
    Department of Biological and Agricultural Engineering,
    College Veterinary Medicine, University of Georgia, Athens, GA
  • Footnotes
    Commercial Relationships  P.A. Moore, None; U.M. Dietrich, None; M.H. Barton, None; C.B. Mosunic, None; M.J. Chandler, None; K.P. Carmichael, None; D.E. Stooksbury, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 5067. doi:
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      P.A. Moore, U.M. Dietrich, M.H. Barton, C.B. Mosunic, M.J. Chandler, K.P. Carmichael, D.E. Stooksbury; The Influence of Rainfall and Temperature on the Frequency of Equine Fungal Keratitis . Invest. Ophthalmol. Vis. Sci. 2005;46(13):5067.

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Abstract

Abstract: : Purpose:To evaluate the influence of rainfall and temperature on the frequency of equine fungal keratitis. Methods:The medical records were searched for equine fungal keratitis (EFK) cases confirmed by cytology, culture, and/or histopathology. The historical date for the onset of ophthalmic signs was recorded. The closest NOAA climate station to the horse’s location was identified. The rainfall measurement (RFM) and maxium daily temperture (MaxDT) and minium daily temperature (MinDT) for 90, 60, 30, and 15 days prior to the historical date of onset were compared to the 30 year mean. Cases occuring during periods of positive and negative rainfall, and periods of high and low MaxDT and MinDT were recorded. Nonparametic statistically analysis was performed by a Wilcoxon Signed Rank Test. Results: Ninety–six confirmed cases were identified. Ninety medical records had complete historical information, and 68 cases had complete rainfall and temperture data. The frequency of EFK was statistically significant when a negative RFM was recorded at 90 (63.24%, N=43)* 60 (58.82%, N=40) *, and between 90–60 (72.06.5%, N=68) *, 90–30 (67.65%, N=46) *, 90–15 (61.76%, N=42) *, and 60–15 (60.29%, N=41) *days prior to the historical date (PHD) of onset . The frequency of EFK was statistically significant when a high MaxDT was recorded at 30 (55.88%, N= 38) * and 15 (70.72, N= 48) *days, and between 30–15 (63.23%, N=43) * days PHD on onset. The frequency of EFK was statistically significant when a high MinDT was recorded 15 (61.76, N= 42) *days, and between 30–15 (62.69%, N= 42) * days PHD of onset. The frequency of EFK was statistically significant when a low MaxDT and low MinDT was recorded at 60 (92.65%, N=63) * days PHD of onset. Conclusions: The frequency of EFK is higher during periods of rainfall deficits and periods of high tempertures that follow a low temperature 60 days prior to the historical data of onset. * 2–tailed p ≤ 0.05

Keywords: fungal disease • keratitis 
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