PRDX5 and infection: Pmp6, Pmp20 and Pmp21 of C. pneumoniae (orthologs of PmpG, PmpB and PmpD of C. trachomatis, respectively) and all Pmps of C. trachomatis are proposed to function as adhesins, based on adhesion assays and specific neutralization of the infection by incubation of the host cells with the recombinant Pmps [25–27].