[Immune characteristics of Plasmodium reinfections in mice following chloroquine cure of primary Plasmodium infections].

OBJECTIVE: infections with chloroquine at the peak of parasitemia. METHODS: infections. The parasitemia levels during primary infections and reinfections were measured by microscopic examinations of Giemsa-stained thin blood films, and the levels of the IgG antibody in sera and the percentages of memory T cell subsets in spleen cells were detected in mice using ELISA and flow cytometry before and after parasite reinfections, respectively. RESULTS: < 0.01). CONCLUSIONS: strains, and a higher-level resistance to re-infections with homogeneous parasite strains is found than with heterogeneous strains.