4-dose series HepA-HepB (Twinrix) accelerated schedule of 3 doses at 0, 7, and 21-30 days, followed by a booster dose at 12 months Human papillomavirus 9-valent (HPV) The following are recommendations for the HPV 9-valent vaccine: Adolescents and adults aged 15-26 years: 2-3 doses...