title: Reply to Lipsitch.
authors: BioDefense Branch, Biosciences Division, Edgewood Chemical Biological Center, Aberdeen Proving Ground.
authors: Andy
authors: A
authors: Kilianski
authors: University of Pittsburgh Medical Center-Center for Health Security, Baltimore.
authors: Jennifer B
authors: JB
authors: Nuzzo
authors: US Military HIV Research Program, Walter Reed Army Institute for Research, Silver Spring, Maryland.
authors: Kayvon
authors: K
authors: Modjarrad