Fig. 2From: HPV infection and bacterial microbiota in the semen from healthy menThe bacterial microbiota in semen samples positive and negative for HPV. No difference was observed in diversity as measured by Chao1 index (a) and Shannon index (b) between HPV-positive (blue) and HPV-negative (red) semen samples. The relative abundances of bacteria are presented on the phylum (c) and family (d) levelsBack to article page