has role protective antigen role protective antigen Haemophilus influenzae protein P145 protein Allen Xiang Following passive immunization, antisera partially protected infant rats from bacteremia resulting from intraperitoneal challenge with bacteria. As assessed by immunoblotting, pooled adult human sera contained antibodies reactive with P145. Following passive immunization, these antisera partially protected infant rats from bacteremia resulting from intraperitoneal challenge with bacteria. Antibody to P145 may contribute to protection against Brazilian purpuric fever [PubMed: 1937817]. Oliver He Protegen ID: 356