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Matthew G Law, Philip S Rosenberg, Ann McDonald and John M Kaldor
Abstract
Objective: To estimate age at HIV infection among
homosexually active men in Australia.
Design: Age-specific back-projection estimates of
HIV incidence.
Methods: Monthly counts of AIDS among homosexually
active men diagnosed by 30 June 1994 and reported by 31 March 1995 were
obtained from the National AIDS Registry and were adjusted for
reporting delays. The progression rate to AIDS was estimated from a
large cohort study of HIV-infected homosexual men, with adjustment
for the effect of age at HIV infection and the effect of antiretroviral
and prophylactic treatments.
Results: The median age at HIV infection was
estimated to have decreased from 31 years of age between 1982 and 1984
to between 23 and 27 years in the periods 1987 to 1989 and 1990 to 1994.
Despite the trend to a younger median age at HIV infection during the
current epidemic, HIV incidence was estimated to have declined in all
age groups from a peak in the mid-1980s. This decline was more
pronounced in the older age groups, with more modest reductions in age
groups under 30 years.
Conclusion: Most HIV infections among homosexually
active men since 1987 appear to have occurred in men aged under 30
years. This has implications for education programs aimed at
preventing HIV infection among homosexually active men.
Full article - ©MJA1996
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