WESTERN-BLOT-ANALYSIS OF ANTIBODY-RESPONSES OF YOUNG INFANTS TO PERTUSSIS INFECTION

Western blot and agglutination techniques were used to analyze the ant ibody responses to Bordetella pertussis in 27 infants less than six mo nth of age with presumed pertussis infection. The antibody response to the Bordetella pertussis adhesins filamentous hemagglutinin, pertacti n and agglutinogens, and to the Bordetella pertussis toxins pertussis toxin and adenylate cyclase-hemolysin were compared. Infection induced intense antibody responses to filamentous hemagglutinin, pertussis to xin and adenylate cyclase-hemolysin. Antibodies to agglutinogens were never detected, and antibodies to pertactin were rarely detected in in fected infants' sera. Therefore, determination of anti-agglutinogens l evels only is not suitable for the serological diagnosis of pertussis in young infants. Use of purified filamentous hemagglutinin, pertussis toxin and adenylate cyclase-hemolysin in Western blot analysis may im prove the serodiagnosis of Bordetella infections. However, care must b e exercised in distinguishing between the antibody response in young i nfants and maternally derived antibodies.