In this area of low prevalence, the lack of endogenous transmission of HIV may be related in part to the lack of a network structure that fosters active propagation, despite the continued presence of risky behaviors. Although the relative contribution of network structure and personal behavior cannot be ascertained from these data, the study suggests an important role for network configuration in the transmission dynamics of HIV.
To clarify risk factors for infection with the human immunodeficiency virus (HIV) we selected at random 785 homosexual men who had participated in studies of hepatitis B in San Francisco in 1978-80 for a follow-up study of the acquired immunodeficiency syndrome. Although most had not been contacted in over five years, 492 (63 per cent) were located and enrolled. The 240 (67 per cent) who had developed antibodies to HIV, as measured by an enzyme-linked immunosorbent assay (ELISA), were compared
IntroductionSince initial reports of the acquired immunodeficiency syndrome (AIDS) in homosexual (gay) men, several investigations have attempted to define behavioral risk factors for
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