Dual Infection with Human Immunodeficiency Virus Type 1 of Distinct Envelope Subtypes in Humans

Andrew W. Artenstein, Thomas C. VanCott, John R. Mascola, Jean K. Carr, Patricia A. Hegerich, Jariyanart Gaywee, Eric Sanders-Buell, Merlin L. Robb, Debora E. Dayhoff, Sataporn Thitivichianlert, Sorachai Nitayaphan, John G. McNeil, Deborah L. Birx, Rodney A. Michael, Donald S. Burke, and Francine E. McCutchan Division of Retrovirology, Walter Reed Army Institute of Research, and Henry M. Jackson Foundation, Rockville, Maryland; Department of Retrovirology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand