Horse Health & Diseases : University of Guelph : Ontario Veterinary College : Strangles : Equid Blog guelphs equine medicine website
"A recent study, presented the 2008 Forum of the
American College of Veterinary Internal Medicine (ACVIM), evaluated
S. equi survival in a more "
real world" situation: outdoors, on objects like fence rails, feed bins and water buckets. These items were experimentally contaminated with
S. equi, and the length of time that the bacteria survived was studied. Surprisingly,
S. equi only lived for a short period of time under these conditions, typically a day or less.
Does this mean that we should allow horses into potentially contaminated areas after only a couple days? Probably not. The results of this study only apply to the conditions that were studied, that is outside with exposure to sunlight, and during the summer. It is safe to assume that survival is short term on farms under these conditions, but it could be longer during cloudy periods and in shady areas. We don’t know the optimal time for which to quarantine stalls and paddocks, but it is reasonable to assume that long-term quarantine, as has been recommended in the past, is not needed in most situations. If it is sunny and there is exposure to sunlight, 1 to 2 weeks is probably well beyond the survival period of
S. equi."
You will also find a link to the Strangles Concensus statement at the bottom of the page.