Isolation of Mycobacterium avium serotype 3 from a white-headed tree duck (Dendrocygna viduata).

Tuberculous lesions were observed at necropsy in the liver of 1 of 10 White-headed Tree ducks (Dendrocygna viduata) imported from Nigeria. Microscopic examination revealed granulomas with acid-fast bacilli; Mycobacterium avium serotype 3 was isolated. Two chickens inoculated intraperitoneally with the isolant had gross and microscopic granulomas in the liver at necropsy 62 days after inoculation. Isolants from chickens were serologically similar to the strain isolated from the duck.