Multiplex PCR products obtained with 12 clinical samples and 4 collection strains of Desulfovibrio. Lanes: 1 and 19, 100-bp DNA ladder; 2 to 13, patients 1 to 12; 14, negative control (water); 15, D. piger (formerly D. pigra) ATCC 29098T; 16, D. desulfuricans strain Essex 6 (ATCC 29577T); 17, D. desulfuricans strain MB (ATCC 27774); and 18, D. fairfieldensis ATCC 700045.