Fig. 1.

Assembling a global panel of Eimeria field samples: countries sampled and parasite occurrence determined by species-specific PCR. Twenty-one countries were sampled for Eimeria spp. occurrence, including all six continents where domestic chickens can be found. The number of samples used for species detection by PCR in each country and the results per species are shown in Table 1. The line labelled 30°N indicates 30° latitude north. Species or operational taxonomic units (OTUs) found to be present in each country/region are shown in blue above the line in each circle, OTUs found to be absent are shown in black beneath the line. a, Eimeria acervulina; b, Eimeria brunetti; ma, Eimeria maxima; mi, Eimeria mitis; n, Eimeria necatrix; p, Eimeria praecox; t, Eimeria tenella; x, OTUx; y, OTUy; z, OTUz. ^∗Data produced in this study. Superscript numbers indicate data derived from the published literature ¹Schwarz et al. (2009); ²Cantacessi et al. (2008); ³Morgan et al. (2009).