In this medical chart abstraction study, pertinent information is collected on all HIV-infected pregnant women and their infants who receive primary or consultative care at PACTG 367 study sites. Part A profiles all HIV-infected women who received care or consultation at study sites and who had a pregnancy outcome between January 1, 1998 through July 1, 1998. [AS PER AMENDMENT 04/12/02: Part A is closed to enrollment.] Part B profiles HIV-infected pregnant women who receive primary or consultative care and a pregnancy outcome following July 1, 1998.