title: A five-year longitudinal analysis of sooty mangabeys naturally infected with simian immunodeficiency virus reveals a slow but progressive decline in CD4+ T-cell count whose magnitude is not predicted by viral load or immune activation.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, 705 Stellar Chance Laboratories, 422 Curie Blvd., Philadelphia, PA 19104, USA.
authors.forename: Jessica
authors.initials: J
authors.lastname: Taaffe
authors.forename: Ann
authors.initials: A
authors.lastname: Chahroudi
authors.forename: Jessica
authors.initials: J
authors.lastname: Engram
authors.forename: Beth
authors.initials: B
authors.lastname: Sumpter
authors.forename: Tracy
authors.initials: T
authors.lastname: Meeker
authors.forename: Sarah
authors.initials: S
authors.lastname: Ratcliffe
authors.forename: Mirko
authors.initials: M
authors.lastname: Paiardini
authors.forename: James
authors.initials: J
authors.lastname: Else
authors.forename: Guido
authors.initials: G
authors.lastname: Silvestri