Immunogenicity and safety of monovalent influenza A (H1N1) 2009 in HIV-infected Thai children

► We evaluate immunogenicity of monovalent influenza A (H1N1) 2009 vaccine in HIV-infected children. ► The vaccine was immunogenic with the serologic response rates of 54.2% and 67.8% after doses 1 and 2. ► There was low level of cross reacting antibody to seasonal influenza A H1N1. ► The vaccine was well tolerated.