Fig. 1

IgM response levels to Cercarial Antigen Preparation (CAP) (a) and Soluble Worm Antigen Preparation (SWAP) (b) according to infection status as determined by parasitology. Schistosome specific IgM antibody levels to CAP and SWAP were determined by Enzyme Linked Immunosorbent Assay (ELISA) and the experiment was done in duplicate. The black bar represents responses to CAP or SWAP for those positive for S. haematobium while the open bar represents those negative. Mean IgM responses are shown with error bars representing standard error of the mean. The Mann Whitney U-test was used to test the difference in IgM response levels to CAP or SWAP between egg positive and egg negative individuals with p values less than 0.05 being significant