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Infect. Immun., Apr 1996, 1246-1251, Vol 64, No. 4
Copyright © 1996, American Society for Microbiology

Immunization with high-molecular-weight adhesion proteins of nontypeable Haemophilus influenzae modifies experimental otitis media in chinchillas

SJ Barenkamp
Department of Pediatrics, St. Louis University School of Medicine, Missouri, USA.

Prevention of nontypeable Haemophilus influenzae otitis media by vaccination is an important health care goal. Proteins important in bacterial adherence deserve consideration as potential vaccine candidates. Two colleagues and I previously identified a family of immunogenic high-molecular-weight proteins important in adherence of nontypeable H. influenzae to human epithelial cells (J.W. St. Geme III, S. Falkow, and S.J. Barenkamp, Proc. Natl. Acad. Sci. USA, 90:2875- 2879, 1993). In the work described here, I determined whether immunization with two such adherence proteins, HMW1 and HMW2, purified from prototype nontypeable Haemophilus strain 12, would modify the course of experimental otitis media caused by the homologous strain. Chinchillas received three monthly subcutaneous injections with 40 microgram of an HMW1/HMW2 protein mixture in Freud's adjuvant. One month after the last injection, animals were challenged by intrabullar inoculation with 300 CFU of nontypeable H. influenzae 12. Infection developed in five of five control animals versus 5 of 10 immunized animals (P = 0.08, Fisher exact, one-tailed). Among infected animals, bacterial counts in middle ear fluid specimens 7 days postchallenge were significantly greater in control animals than in immunized animals (P = 0.014, Mann-Whitney U test). Serum antibody titers following immunization were comparable in uninfected and infected animals. However, infection in immunized animals was uniformly associated with the appearance of bacteria downregulated in expression of the high- molecular-weight proteins, suggesting bacterial selection in response to immunologic pressure. Although protection following immunization was incomplete, these data suggest that the high-molecular-weight adhesion proteins are potentially important protective antigens which might represent one component of a multicomponent nontypeable Haemophilus vaccine.

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