deVincenzi (ESG)1994.

Methods	Prospective study of sexually active HIV discordant heterosexual couples (incidence estimation and associated risk factors)
Participants	‐ 8 countries in European Community, hospital wards, outpatient clinics, STD clinics, public health departments ‐ enrolled from 3/87‐ 3/91 ‐ M+F‐ couples (n=157) ‐ F+M‐ couples (n=88) ‐ IC type: IVDU (predom.), transfusion, bisexual, heterosexual ‐ partner exclusions: IVDU, male homosexuals, recipients of unscreened blood products, multiple sexual partners, one or more sexual partners from sub‐Saharan Africa or w/ above risk factor
Interventions	‐ counselling about HIV and safe sex ‐ @ 6mo counselling, HIV serotest, sexual history
Outcomes	Vaginal and anal condom usage ‐ always (100%) ‐ inconsistent (0‐99%) HIV serotesting by ELISA, confirmed by Western blot or radioimmunoprecipitation
Notes	‐ "always" users were those who used condoms for all vaginal AND anal contacts ‐ STDs in partners