Figure 2

Distribution of multiple infections on the basis of HPV combinations. H+H: double infection by two high-risk HPVs; H+L: double infection by one high- and one low-risk HPVs; L+L: double infection by two low-risk HPVs; H+P: double infection by one high- and one probable/possible-risk HPVs; L+P: double infection by one low- and one probable/possible-risk HPVs; H+H+P: triple infection by two high-risk and one probable/possible-risk HPVs; H+H+L: triple infection by two high-risk and one low-risk HPVs; P+P: double infection by two probable/possible-risk HPVs.