The immunoglobulin G (IgG) subclass distribution of antibodies to merozoite surface antigen 2 of Plasmodium falciparum in Solomon Islanders showed marked skewing towards the IgG3 subclass. This was not observed with crude P. falciparum schizont antigen. IgG3 responses may be short-lived and require repeated restimulation for their maintenance. This may be provided by persistent infection (premunition) or new infections.
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Rzepczyk et al. (1997) studied this question.