DIE-OFF, AVIAN - RUSSIA: (KRASNOYARSK) WILD BIRD, BOTULISM
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Date: Mon 5 Sep 2011
Source: Komsomolskaya Pravda [in Russian, trans. Corr.ATS, edited] <http://www.krsk.kp.ru/daily/25747.5/2734825/>
Mass bird mortality in a popular Siberian lake due to lethal toxin
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About 600 ducks have died during the last 2 weeks in the popular resort Lake Tagar in [Minusinsk district], Krasnoyarsk krai [territory]. The regional veterinarians have been working hard to identify the cause of the die off. They excluded one cause after another. A similar die-off happened in the same place a year ago, similarly in September [2010], affecting about 2000 ducks. At that time the cause remained obscure -- in contrast to the current event.
The specialists have found that organic decay of vegetation in the lake was the background to the production of the bacterium _Clostridium botulinum_.
The bacteria produced toxins which accumulated in the weed growing in the water. Then the ducks ate the botulinum toxin contaminated weed.
The specialists have recommended frightening off the birds since the lake is a landing place for migratory birds. Additionally, all the organic matter has to be removed from the lake and the water oxygenated. The reed growth should be burned during winter. Nearby water bodies are being treated the same way.
[Byline: Svetlana Mikhaylova]
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[Minusinsk District is an administrative and municipal district (raion), one of the 43 in Krasnoyarsk territory, central Siberia, Russia; see map at <http://healthmap.org/r/1dQW>.
Botulism is an intoxication caused by ingesting _Clostridium botulinum_ exotoxin or by absorbing toxin produced in the alimentary tract (toxico-infection). The causative toxin in birds is mainly of type C.
The zoonotic potential of type C botulism is minimal, even negligible.
Only 4 poorly documented type C botulism intoxications have been reported in people, but cases have occurred in nonhuman primates.
For more information on avian botulism, see moderator TG's detailed comment in ProMED-mail posting 20100709.2294.
Botulism is not an OIE-listed disease, but may be included in annual reports voluntarily. - Mod.AS]
[see also:
Die-off, avian - Russia: (KX) wild bird, RFI 20110901.2674 2010
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Undiagnosed die-off, avian - Russia: (KX) wild birds, RFI Botulism, avian - USA (03): (CA) 20100709.2294
2004
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Botulism, birds, fish - Canada (Lake Ontario): susp. 20040825.2376
2003
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Botulism, waterbirds - Australia (NT) 20030108.0061
2002
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Botulism, fish, birds - Canada, USA (Lake Erie) (03) 20021209.6023] .................................................arn/mj/dk/ll
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