Abstract
Six strains of feline herpesvirus were isolated alone or in association withthe feline picornaviruses from eight domestic cats showing the respiratory syndrome. Allof them agglutinated feline erythrocytes. Their hemagglutinating activities were enhancedby treatment with ethyl ether. These strains could not be distinguished from one anotherby the serum-neutralization test.Biological and physicochemical properties of feline herpesvirus were investigated. Thestatus of feline viral respiratory infections in Japan was also discussed.
