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Possibilities of bacteremia and toxemia in death of chickens infected with Eimeria tenella.

The possibility that bacteremia and toxemia were the causes of death in cases of cecal coccidiosis was investigated. Germ-free and ordinary chickens with microflora were inoculated with sporulated oocysts of Eimeria tenella. At 5 days postinoculation, cecal lesions in ordinary chickens were more severe than those in germ-free ones. Cardiac blood, spleen, and liver were examined in ordinary chickens for bacteremia and endotoxemia, and small numbers of bacteria were recovered from both infected and uninfected birds. Endotoxin levels in plasma of E. tenella-infected birds were low and not different from the levels of uninfected controls. To examine unknown toxic factors, a large volume of serum from infected chickens was injected intravenously into uninfected birds. No significant clinical signs were observed. It is concluded that the intestinal bacteria increase the severity of coccidial lesions without bacteremia and toxemia.