ERVW-1 and infection: The overall patterns of gag, pol, and env diversity were qualitatively similar in women from the PEPI-Malawi trial (pregnant women, likely to have been infected with HIV-1 subtype C; recent infection defined by the MAA) and adults from the US (men and women with different risk factors for HIV infection, likely to have been infected with HIV-1 subtype B; recent infection documented by HIV seroconversion).