EOSINOPHILIC MENINGITIS IN 2 COWS

A neurological disorder was noted in 5 cows on a farm. Histopathologic al examination in 2 of these 5 animals revealed an infiltration of eos inophils with some macrophages in the meninges and around arterioles o f the cerebral cortex. The endothelial cells of the reactive blood ves sels were swollen. From these observations, the brain lesions were dia gnosed as ''eosinophilic meningitis''. In one case, pulmonary arteriol es were also infiltrated with eosinophils and macrophages in a granulo matous tissue. No bacteria, fungi, protozoa, or parasitic worms were d etected in the present cases.