CD40LG and malaria: Druilhe et al. [62] have hypothesized that the STHs and schistosomes immunomodulate the host to increase malaria susceptibility by shifting their humoral responses from malaria-protective, cytophilic humoral antibodies (IgG1 and IgG3) to nonprotective, noncytophilic subclasses (IgG2, IgG4, and IgM).