Human papilloma virus vaccination induces strong human papilloma virus specific cell-mediated immune responses in HIV-infected adolescents and young adults

The ability of a quadrivalent human papillomavirus (HPV)-16/18/6/11 virus-like particles vaccine (Gardasil) to elicit HPV-specific cell-mediated immune responses was evaluated in antiretroviral therapy (ART)-treated HIV-infected young adults. Results showed that, after three doses of vaccine, central memory and effector memory CD4(+) and CD8(+) T lymphocytes, as well as HPV-specific interleukin (IL)2(+)/CD4(+), interferon-gamma (IFN-gamma(+))/CD4(+), IFN-gamma(+)/CD8(+) and tumour necrosis factor-alpha (TNF-alpha)(+)/CD8(+) T lymphocytes and Perforin and Granzyme B secreting CD8(+) T lymphocytes were significantly increased. Notably, results obtained in HIV-infected patients were comparable to those seen in HIV-uninfected age-matched healthy controls.