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Histological changes in mouse liver and spleen caused by different Coxiella burnetii antigenic preparations.

The effect was examined on mouse liver and spleen (inbred line A) of intraperitoneal (i.p.) inoculation of phase I Coxiella burnetii (C.b.) cells either untreated or treated with chloroform-methanol (CM) mixture in comparison to the trichloracetic acid extract (TCAE) from phase I C.b.) cells. The phase I C.b. cells were highly toxic as manifested by marked hepatosplenomegaly accompanied with hyperplastic, degenerative and necrotic changes in the liver. By contrast, phase I CM--treated C.b. cells and TCAE were nontoxic as evidenced by the absence of any distinct pathological changes in mouse viscera.