title: Sensing retroviruses.
abstract: Sensing pathogens is an essential first step in the initiation of a host response to infection. In this issue of Immunity, Kane et al. (2011) used mouse models to demonstrate that Toll-like receptor 7 is required for the generation of an antibody response to infection by retroviruses.
authors.affiliation: Howard Hughes Medical Institute, Aaron Diamond AIDS Research Center, The Rockefeller University, 455 First Avenue, New York, NY 10016, USA.
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Liberatore
authors.forename: Paul D
authors.initials: PD
authors.lastname: Bieniasz