ERVW-1 and infection: Env deletions in the hypervariable regions V1, V2, and V4 in particular have been previously reported in both adult and neonate infections by different SHIVs using variations of the CH848 Env; SHIV CH848TF [11] and SHIV CH848 10.17 DT.E169K [12] (Holmes S, Williams WB et al., submitted).