A case of disseminated infection by Chlorella sp. is reported in a sheep in semiarid region of Paraíba, northeastern Brazil. The animal showed weight loss and abdominal distension. At necropsy greenish nodules were observed in liver, lung, intestine and lymph nodes. Histologically the nodules corresponded to pyogranulomas with myriad of intralesional algae. Probably the infection occurred as a result of the consumption of stagnant water or grass which had been cut in an irrigated area, conditions that are common in the dry season in the semiarid region.
green alga; Chlorella sp.; diseases of sheep
