FCGR2A and tuberculosis: Given the similar M. tuberculosis infection course in FcγR-hu and C57BL/6 wild-type mice and the protection of murine P1AM25 IgG2a against TB in C57BL/6 mice, we investigated the protective efficacy of human P1AM25 IgG1 in M. tuberculosis–infected FcγR-hu mice.