Production of IgG antibodies to pneumococcal polysaccharides is associated with expansion of ICOS+ circulating memory T follicular-helper cells which is impaired by HIV infection. - Abudulai LN; Fernandez S; Corscadden K; Burrows SA; Hunter M; Tjiam MC; Kirkham LS; Post JJ; French MA (PloS one, 2017)