Biological and Immunological Studies of Listerella

Abstract

The genus Listerella is characterized by little saccharolytic or biochemical activity. The virulence of this group is widespread among animals and may be measured experimentally as very high. The conjunctivitis and keratitis induced by Listerella appears to be the most characteristic sign of the organism and constitutes a unique reaction in infectivity. Serologically the genus appears to be composed of at least 2 specific types, and it is possible the types are associated with ultimate, animal origin. Antisera of high agglutinating titers offer little or no protection in infection in mice. Listerella does not stimulate "heterophile" antibody during active infection or prolonged immunization.