<prompt> Which of the following is true regarding HPV vaccine strains? Current WHO recommendations for HPV vaccination is:Bivalent vaccine 6,11 strainsQuadrivalent vaccine 6,11,16,58 strainssingle dose to girls if initiated prior to 15 years of age2 doses recommended irrespective of age, gender, type of vaccine  <response>: 2 doses of HPV vaccine are recommended irrespective of age, gender, type of vaccine. Option 1: Bivalent vaccine- serotype 16,18 cervarix. Option 2: Quadrivalent vaccine- serotype 6,11,16,18 Gardasil,Merck. Option 3, 4: The first dose is recommended for most persons before 15 years of age and the second dose should be given 6 to 12 months after the first dose. A 3-dose schedule is recommended for people who get the first dose on or after 15 years of age, and for people with ceain immunocompromising conditions. 