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Memórias do Instituto Oswaldo Cruz
Print version ISSN 0074-0276
ANDRADE, Virgínia; BARRAL NETTO, Manoel; ANDRADE, Sonia G. and MAGALHAES, Juracy B.. Immunological aspects of infection of 6 inbred strains of mice by 3 different strains of Trypanosoma cruzi. Mem. Inst. Oswaldo Cruz [online]. 1985, vol.80, n.2, pp. 203-211. ISSN 0074-0276. http://dx.doi.org/10.1590/S0074-02761985000200011.
We evaluated humoral and cellular immune responses in 6 inbred mouse strains (BALB/c, B-10, C3H, A/J, AKR and DBA) infected with 3 Trypanosoma cruzi strains (Peruvian, 21 SF and Colombian), which are the standards for the 3 strains Types of Andrade's classification. Negative delayed-type hipersensitivity reactions to parasite antigens were evidence of suppressed cell-mediated immunity. An early drop of IgG1 and rise of IgM levels were observed in almost all mouse strains infected by any T. cruzi strain. Elevation of IgG2a and/or IgG2b levels was higher in resistant mouse strains. Anti-T. cruzi antibody levels (Indirect immunofluorescence and ELISA) did not correlate with survival. Despite some differences among mouse strains there was a definition of an overall pattern of host response and the maintenance of biological standards which characterize the basic types of T. cruzi strains.