Macrorhabdus ornithogaster

Macrorhabdus ornithogaster

an ascomycetous yeast that causes megabacteriosis in budgerigars.
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In another bird, a mild lymphoplasmacytic infiltration of the proventriculus and ventriculus was observed along with the presence of a small number of Macrorhabdus ornithogaster on the mucosal surface.
Except for the isolation of moderate numbers of Macrorhabdus ornithogaster from the proventriculus of the red-crowned parakeet, routine diagnostic procedures failed to demonstrate any parasitic, bacterial, or fungal pathogens in the 3 birds.
Results of a parasitologic examination of the intestines and direct microscopic examination by wet mount of the mucosa of the proventriculus for Macrorhabdus ornithogaster were negative.