Behavioural risk factors for HIV/AIDS in Bangladesh were reviewed in a prec
eding article in this journal(1). Omitted from that review was a discussion
of potential biomedical risk factors including: (i) an unregulated blood s
upply system in which blood used in transfusions is not screened for HIV an
d is donated primarily by professional donors: (ii) unsterile injections in
non-formal and formal health-care settings; and (iii) a high prevalence in
high-risk groups of other sexually transmitted diseases (STDs) which may f
unction as co-factors for HIV transmission, particularly if chronically unt
reated. Studies elsewhere in the world suggest that the unregulated blood s
upply system, in particular, poses a serious danger in terms of the spread
of the HIV epidemic. While certain socio-cultural factors may be contributi
ng to low levels of HIV in Bangladesh, the prevalence of biomedical and beh
avioural risk factors suggest the importance of implementing targeted cost-
effective interventions now.