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Avian botulism and avian chlamydiosis in wild water birds, Benton Lake National Wildlife Refuge, Montana, USA.

In 1999, the US Geological Survey National Wildlife Health Center, Madison, Wisconsin, conducted a diagnostic investigation into a water bird mortality event involving intoxication with avian botulism type C and infection with avian chlamydiosis at the Benton Lake National Wildlife Refuge in Montana, USA. Of 24 carcasses necropsied, 11 had lesions consistent with avian chlamydiosis, including 2 that tested positive for infectious Chlamydophila psittaci, and 12 were positive for avian botulism type C. One bird tested positive for both avian botulism type C and C psittaci. Of 61 apparently healthy water birds sampled and released, 13 had serologic evidence of C psittaci infection and 7 were, at the time of capture, shedding infectious C psittaci via the cloacal or oropharyngeal route. Because more routinely diagnosed disease conditions may mask avian chlamydiosis, these findings support the need for a comprehensive diagnostic investigation when determining the cause of a wildlife mortality event.

J Zoo Wildl Med. 2012;43:885-888.

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Author:Docherty, D.E.; Franson, J.C.; Brannian, R.E.
Publication:Journal of Avian Medicine and Surgery
Article Type:Reprint
Geographic Code:1USA
Date:Mar 1, 2013
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