ANTIGENS OF SURFACE STRUCTURES OF HAEMOPHILUS INFLUENZAE AS PERSPECTIVE VACCINE-CANDIDATES

Abstract

Despite long and successful use of Haemophilus influenzae b (Hib) vaccine, production of the vaccine against non-typed strains of Haemophilus influenzae (NTHi) is only being developed. Difficulties of this work are determined by features of NTHi compared with Hib: lack of polysaccharide capsule, high level of antigenic heterogeneity and specialties of pathogenesis development that includes spread through the organism from mucosa of the respiratory tract. Currently, 15 surface structures of NTHi are being actively studied with the aim of creating the vaccine. PE, P2, P6, PD proteins, outer membrane vesicles (OMVs) and others are among them. Only PD protein currently has practical application, that was used as a carrier with antigenic function in conjugated polysaccharide vaccines against pneumonia (Prevenar; PHiD-CV). Vaccination with these preparations allowed to reduce the total morbidity with acute rhinitis on children by 33 - 52%. However, this result can not be examined as final, thus, research and approbation of the vaccine-candidates continues.