Fig. 6

The distribution of co-infection of HPV18 with other high-risk HPV subtypes in HNSCC. The most commonly co-infected subtype was HPV18/58 (33/98; 33.7%) followed by HPV18/45 (17/98; 17.3%), HPV18/16 (13/98; 13.2%), HPV 18/52 (12/98; 12.2%), HPV18/31 (7/98; 7.1%), HPV18/35 and HPV16/51 (3/98; 3.1% each). Since, HPV33 was not present in the cohort, there was no co-expression for HPV18 with these subtypes