Antibody Responses to Pneumococcal Vaccines Among HIV-Infected Adults.

Immunological Efficacy of a Prime-Boost Strategy Combining a 7-Valent Pneumococcal Conjugate Vaccine (PCV) Followed by a 23-Valent Pneumococcal Polysaccharide Vaccine (PPV) Versus PPV Alone in HIV-Infected Adults. ANRS 114 PNEUMOVAC.

Streptococcus pneumoniae is the major cause of bacterial infection in HIV-infected patients. The current pneumococcal vaccine is poorly efficacious in patients with a CD4 cell count lower than 500/mm3. This study will test the efficacy and safety of a new pneumococcal vaccine strategy in patients with a CD4 cell count between 200 and 500/mm3.

Streptococcus pneumoniae (SP) is the major cause of bacterial infection in HIV-infected patients. The 23-valent pneumococcal polysaccharide (PPV) is poorly immunogenic in patients with CD4 below 500 cells/mm3. The purpose of this multicentric national study is to evaluate whether a prime with a 7-valent pneumococcal conjugate vaccine (PCV), able to induce immunological memory, would improve immunogenicity against SP polysaccharides. 212 HIV-1 infected patients, with a CD4 count between 200 and 500/mm3, will be randomly assigned to one of two vaccine groups: PCV at Week 0 followed by PPV at Week 4 or PPV alone at Week 4. Evaluation will be done at week 8. The primary endpoint is the proportion of patients who had antibody responses against 7 pneumococcal polysaccharides at Week 8. Secondary endpoints include the persistence of antibody responses at Weeks 24 and 96, vaccines safety and occurrence of pneumococcal disease over time.

Inclusion Criteria: Adult patients with proven HIV-1 infection Naïve or antiretroviral experienced CD4 cell count between 200 and 500/mm3 Plasma HIV RNA load lower than 4 log10 copies/mL Signed written informed consent Exclusion Criteria: Immunotherapy Immunization with the PPV within the past 5 years Splenectomy Use of intravenous immunoglobulin within the past 2 months Chemotherapy or radiation Any other vaccination within the past 2 months Severe renal failure End-stage liver disease Pregnancy

Rabian C, Tschope I, Lesprit P, Katlama C, Molina JM, Meynard JL, Delfraissy JF, Chene G, Levy Y; ANRS 114 Pneumovac Study Group. Cellular CD4 T cell responses to the diphtheria-derived carrier protein of conjugated pneumococcal vaccine and antibody response to pneumococcal vaccination in HIV-infected adults. Clin Infect Dis. 2010 Apr 15;50(8):1174-83. doi: 10.1086/651418.