An outbreak of spirochetosis occurred in a flock of 75 game chickens i
n California during fall 1991. Affected birds were weak and anemic. Ma
ny had greenish diarrhea. Spirochetes were seen on Giemsa-stained bloo
d smears and in silver-stained tissue sections of kidney, liver, and s
pleen. Splenomegaly, which is reported to be characteristic of fowl sp
irochetosis, was not observed in two acutely infected chickens.