Schematic diagram to depict the current and next generation of preventive HPV vaccines. a Cervarix™ composed of HPV16 and HPV18 VLPs. b Gardasil® composed of HPV6, HPV11, HPV16, and HPV18 VLPs. c Gardasil®9 composed of HPV6, HPV11, HPV16, HPV18, HPV31, HPV33, HP-45, HPV52, and HPV58 VLPs. d L1 capsomer vaccine. e L2 peptide vaccine. f Concatenated L2 peptide vaccine. g Chimeric L1-L2 VLP vaccine with L2 on the surface