Some Individuals with Repetitive Exposure to High Doses of Schistosoma $\gamma$

Multiple Choice

Some individuals with repetitive exposure to high doses of Schistosoma mansoni develop resistance to re-infection by this helminthic parasite. In contrast, other individuals remain highly susceptible. Population studies showed that resistant individuals had increased numbers of circulating eosinophils in their blood compared to susceptible individuals, and further, that these eosinophils had increased levels of:

A) Complement receptor, CR1
B) Mannose binding lectin
C) Fc $\gamma$ RII, the low affinity IgE receptor
D) Fc $\gamma$ RII-B, the inhibitor IgG receptor
E) Anti-microbial ficolins