A field investigation was conducted on a flock of adult hobby chickens showing intermittent signs of enteritis. Roosters examined in the initial field visit and postmortem had cecal worms, roundworms, tetratrichomonads, and coccidiosis. Macrorhabdus ornithogaster was diagnosed histologically in the mucosal isthmus of the proventriculus and ventriculus. Three roosters and two hens were examined in a follow-up investigation of the flock conducted 9 days later. Macrorhabdus ornithogaster was confirmed in one hen.
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Vol. 55 • No. 2