This study aimed to analyze the sequence variations in the mitochondrial cytochrome b (cytb) genes among Gnathostoma doloresi isolates from wild boar in Hunan province, and to reveal its genetic relationships between G.doloresi and other nematodes using cytb gene sequences. The cytb genes of G.doloresi were amplified by PCR and sequenced. The analysis results showed that the length of mitochondrial cytb sequences of 8 isolates were 1,067bp, and the similarities of the corresponding sequences, except Hunan isolates, were more than 98.3% among G.doloresi, and the homology of Hunan isolates and r...