All but one macaque (Rh6601, IDLV+protein group) was infected, with two macaques (Rh6600, IDLV+protein group and Rh6575, IDLV only group) resisting infection up to the tenth challenge.4 In these three macaques, we measured the frequency of Env immunogen-specific memory B-cell responses after the last non-stabilized gp140 Env and SOSIP administrations (weeks 75 and 117, respectively). Here, ERVW-1 is linked to infection.