title: Conclusions from Swiss study questioned.
authors.affiliation: European Centre for Disease Prevention and Control, Stockholm, Sweden.
mesh_terms: D018562:Disease Transmission, Infectious / Q000517:prevention & control*; D015658:HIV Infections / Q000517:prevention & control* / Q000635:transmission; D006801:Humans; D015203:Reproducibility of Results; D040242:Risk Reduction Behavior; D021841:Safe Sex; D013557:Switzerland