Objective: To assess risk factors for infection and to determine HIV p
revalence in a sample of international travellers. Design: A cross-sec
tional survey of new patients attending a hospital outpatient clinic,
and self-completion of an anonymous questionnaire on sexual behaviour
prior to and during travel. Urine samples were tested for the presence
of antibodies to HIV. Setting: The Hospital for Tropical Diseases, Lo
ndon, UK. Subjects: All new patients over a 6-month period. Results: O
f 782 people approached, 757 (97%) agreed to participate: 141 (18.6%)
had had new sexual partners during their most recent trip abroad. Almo
st two-thirds of those having sex abroad did not use condoms on every
occasion with a new partner, and 5.7% contracted a sexually transmitte
d disease (STD) during their most recent trip; 26% of men from World H
ealth Organization Pattern I countries who had new sexual partners abr
oad paid for sex. Sixteen out of 731 (2.2%) participants were HIV-anti
body-positive. HIV positivity was associated with being born in east,
central or southern Africa, having symptoms of an STD since arriving i
n the United Kingdom and being treated for an STD since arrival. Concl
usion: The rates of unsafe sex and payment for sex abroad reported by
these international travellers indicate the potential for contracting
and transmitting STD, including HIV, in both their foreign and domesti
c sexual partnerships. With the increasing HIV incidence in Asia (the
most common destination for UK travellers after sub-Saharan Africa), t
he number of cases of HIV contracted abroad may rise in the future.