Seroprevalence of anti Toxoplasma gondii IgM antibodies in subjects in Qatar. A. By age class in the whole study population (n = 1625). B. By age class and host sex in the 4 older age classes (11+ years old; n = 1195). C. By different regions of origin in the whole dataset (n = 1625). D. By regions of origin but confined to the 4 older age classes (10+ years, n = 1195).