ERVW-1 and AIDS: We selected MconSgp120 as the Env “bait” to isolate antigen-specific memory B cells, as this reagent most closely aligned with HIV clade C and clade B viruses, which were the clades with which the Malawian Center for HIV/AIDS Vaccine Immunology 009 (CHAVI009) and U.S. WITS pregnant women were primarily infected.