An outbreak of mortality in chickens and Japanese quail sharing the same airspace was investigated. Marek's disease was diagnosed in five of 11 chickens examined, and in 20 of 24 quail; crop candidiasis was found in four of the chickens and in five of the quail, and moderate to large numbers of organisms referred to as megabacteria were observed in eight of the chickens and 16 of the quail. The disease was so severe that almost all of the quail in the flock died or were culled during the following six months. In contrast, only approximately 5 per cent of the chickens died from Marek's disease.
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