IMMUNOGENICITY ASSESSMENT FOR LUNG-STAGE AND BIOMPHALARIA ALEXANDRINA COCKTAIL VACCINE IN SCHISTOSOMA MANSONI INFECTED MICE

Abstract

The availability of a new vaccine is usually needed as an additional component to chemotherapy for control of schistosomiasis. Different strategies of different types of vaccines were assessed to decrease morbidity but did not give the best protection. The study assessed the efficacy of BAAP, SLAP and their combined preparations together with BCG adjuvant as an effective anti-schistosomal vaccine.Six groups of Swiss albino mice were used; (Gl) as a control, (G2) infected non immunized; (G3) infected and supported by Adj.; (G4) infected; vaccinated with BAAP and supported by Adj.; (G5) infected, vaccinated with SLAP and supported by Adj. and the target group (G6) infected, vaccinated with combined antigens (BAAP + SLAP) and supported by Adjuvant. Mice were sacrificed 8 weeks post infection for assessment the effect of our vaccine through parasitological, histopathological, serological and immunohisto- chemical study. The vaccination of mice with BAAP, SLAP and Adjuvant followed by challenge S. mansoni infection resulted in highest reduction percentages (92% & 86%) for mean numbers of adult burdens and fecal egg counts respectively,(82.4%, 81%) for granuloma number and diameter respectively compared with other groups. The improvement % of all measured enzymes was higher in G6 than other groups.IL1O was significantly increased in G6 than other groups; also, TNF was significantly decreased in G6 than other groups.