FIG. 1.

Field polymorphism of B. rossi strains in South Africa, as evidenced by PCR amplification of the BrEMA1 repeat region with primers FrepBrEMA1 and RrepBrEMA1. PCR products were loaded on a 1.5% agarose gel. PCR profiles of the most encountered genotypes (11, 19, 28, and 29) and that of genotype6 are indicated on the picture as follows: lanes 15 and 17 represent genotype29; lanes 1, 5, 7, and 14 represent genotype28; lanes 2, 10, 11, 12, and 13 represent genotype19; lanes 4, 6, 9, and 16 represent genotype11; lane 8 represents genotype6, and lane 19 is the 100-bp marker.