The aim of the study was to evaluate the effect of having an HIV-posit
ive or negative test result on sexual risk behaviour before and after
the test. Longitudinal retrospective case-note survey identifying new
episodes of sexually transmitted disease (STD) infections in 114 subje
cts testing HIV positive and 114 matched negatives were examined at th
e Genitourinary Medicine Department, St Mary's Hospital, Paddington, L
ondon. Across the whole sample in the year after HIV testing the numbe
r of cases of new STD infections was 40% of the number of cases in the
year prior to HIV testing. There was no association between serostatu
s and incidence of STD infections before and after HIV testing. Of tho
se testing negative, 5.3% were identified as having a new infection in
the year after the HIV test, while amongst those testing positive the
re was a rate of new STDs of 2.6%. In conclusion, there was no evidenc
e that having a negative test result increased the risk of acquisition
of new STDs. Rates of new STD infections amongst seropositives in the
year after HIV testing were low.