 In addition Cervarix induced twice as many memory B cells as Gardasil for both these HPV strains.In the UK it was included in the national vaccination programme for teenage and pre-teenage girls aged 12–13 and 17–18 from September 2008 to August 2012.This caused some controversy since Cervarix was chosen over Gardasil, even though Gardasil protects against additional HPV types 6 and 11 (which cause genital warts).