title: Increases in Condomless Sex in the Swiss HIV Cohort Study.
abstract: Condomless sex is a key driver of sexually transmitted diseases. In this study, we assess the long-term changes (2000-2013) of the occurrence of condomless sex among human immunodeficiency virus (HIV)-infected individuals enrolled in the Swiss HIV Cohort study. The frequencies with which HIV-infected individuals reported condomless sex were either stable or only weakly increasing for 2000-2008. For 2008-2013, these rates increased significantly for stable relationships among heterosexuals and men who have sex with men (MSM) and for occasional relationships among MSM. Our results highlight the increasing public health challenge posed by condomless sex and show that condomless sex has been increasing even in the most recent years.
authors.affiliation: University Hospital Zurich Division of Infectious Diseases and Hospital Epidemiology ; Institute of Medical Virology , University of Zurich , Switzerland.
authors.forename: Roger D
authors.initials: RD
authors.lastname: Kouyos
authors.affiliation: University Hospital Zurich Division of Infectious Diseases and Hospital Epidemiology.
authors.forename: Barbara
authors.initials: B
authors.lastname: Hasse
authors.affiliation: Division of Infectious Diseases , Geneva University Hospital , Switzerland.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Calmy
authors.affiliation: Division of Immunology , University Hospital Lausanne , Switzerland.
authors.forename: Matthias
authors.initials: M
authors.lastname: Cavassini
authors.affiliation: Department of Infectious Diseases , Bern University Hospital and University of Bern , Switzerland.
authors.forename: Hansjakob
authors.initials: H
authors.lastname: Furrer
authors.affiliation: Division of Infectious Diseases and Hospital Epidemiology , University Hospital Basel , Switzerland.
authors.forename: Marcel
authors.initials: M
authors.lastname: Stöckle
authors.affiliation: Division of Infectious Diseases , Cantonal Hospital St. Gallen , Switzerland.
authors.forename: Pietro L
authors.initials: PL
authors.lastname: Vernazza
authors.affiliation: Division of Infectious Diseases , Regional Hospital Lugano , Switzerland.
authors.forename: Enos
authors.initials: E
authors.lastname: Bernasconi
authors.affiliation: University Hospital Zurich Division of Infectious Diseases and Hospital Epidemiology.
authors.forename: Rainer
authors.initials: R
authors.lastname: Weber
authors.affiliation: University Hospital Zurich Division of Infectious Diseases and Hospital Epidemiology ; Institute of Medical Virology , University of Zurich , Switzerland.
authors.forename: Huldrych F
authors.initials: HF
authors.lastname: Günthard
authors.forename: V
authors.initials: V
authors.lastname: Aubert
authors.forename: M
authors.initials: M
authors.lastname: Battegay
authors.forename: E
authors.initials: E
authors.lastname: Bernasconi
authors.forename: J
authors.initials: J
authors.lastname: Böni
authors.forename: H C
authors.initials: HC
authors.lastname: Bucher
authors.forename: C
authors.initials: C
authors.lastname: Burton-Jeangros
authors.forename: A
authors.initials: A
authors.lastname: Calmy
authors.forename: M
authors.initials: M
authors.lastname: Cavassini
authors.forename: G
authors.initials: G
authors.lastname: Dollenmaier
authors.forename: M
authors.initials: M
authors.lastname: Egger
authors.forename: L
authors.initials: L
authors.lastname: Elzi
authors.forename: J
authors.initials: J
authors.lastname: Fehr
authors.forename: J
authors.initials: J
authors.lastname: Fellay
authors.forename: H
authors.initials: H
authors.lastname: Furrer
authors.forename: C A
authors.initials: CA
authors.lastname: Fux
authors.forename: M
authors.initials: M
authors.lastname: Gorgievski
authors.forename: H
authors.initials: H
authors.lastname: Günthard
authors.forename: D
authors.initials: D
authors.lastname: Haerry
authors.forename: B
authors.initials: B
authors.lastname: Hasse
authors.forename: H H
authors.initials: HH
authors.lastname: Hirsch
authors.forename: M
authors.initials: M
authors.lastname: Hoffmann
authors.forename: I
authors.initials: I
authors.lastname: Hösli
authors.forename: C
authors.initials: C
authors.lastname: Kahlert
authors.forename: L
authors.initials: L
authors.lastname: Kaiser
authors.forename: O
authors.initials: O
authors.lastname: Keiser
authors.forename: T
authors.initials: T
authors.lastname: Klimkait
authors.forename: R
authors.initials: R
authors.lastname: Kouyos
authors.forename: H
authors.initials: H
authors.lastname: Kovari
authors.forename: B
authors.initials: B
authors.lastname: Ledergerber
authors.forename: G
authors.initials: G
authors.lastname: Martinetti
authors.forename: B Martinez
authors.initials: BM
authors.lastname: de Tejada
authors.forename: K
authors.initials: K
authors.lastname: Metzner
authors.forename: N
authors.initials: N
authors.lastname: Müller
authors.forename: D
authors.initials: D
authors.lastname: Nadal
authors.forename: D
authors.initials: D
authors.lastname: Nicca
authors.forename: G
authors.initials: G
authors.lastname: Pantaleo
authors.forename: A
authors.initials: A
authors.lastname: Rauch
authors.forename: S
authors.initials: S
authors.lastname: Regenass
authors.forename: M
authors.initials: M
authors.lastname: Rickenbach
authors.forename: C
authors.initials: C
authors.lastname: Rudin
authors.forename: F
authors.initials: F
authors.lastname: Schöni-Affolter
authors.forename: P
authors.initials: P
authors.lastname: Schmid
authors.forename: J
authors.initials: J
authors.lastname: Schüpbach
authors.forename: R
authors.initials: R
authors.lastname: Speck
authors.forename: P
authors.initials: P
authors.lastname: Tarr
authors.forename: A
authors.initials: A
authors.lastname: Trkola
authors.forename: P
authors.initials: P
authors.lastname: Vernazza
authors.forename: R
authors.initials: R
authors.lastname: Weber
authors.forename: S
authors.initials: S
authors.lastname: Yerly
keywords: HIV transmission; STI prevention; STI transmission; condomless sex