RAPD profiles of C. parvum isolates. Lanes: M, 1-kb DNA ladder with arrowheads indicating bands (from top to bottom) of approximately 3.0, 2.0, 1.6, 1.0, 0.5, and 0.35 kb; 1 and 5, ERS1-2; 2 and 6, CP7278; 3 and 7, CP7284; 4 and 8, CP6742. Primers used were GPD62 (lanes 1 to 4) and GPD63 (lanes 5 to 8).