![]() ![]() We found a large, linked, hidden network among participants, with no discernible clustering of closely related strains. Moreover, 27% of nominees were not drug users.Ĭonclusions. In multivariate analysis, 7 health-related and drug-use variables remained independently associated with infection. Overall strain similarity was unusually high, suggesting spread within and across networks. ![]() One third of participants were either colonized (20%) or infected (19%) with S. We identified 89 sociocentric risk networks, 1 of which contained 327 (67%) members. Participants were asked to nominate up to 10 members of their social networks, and they were invited to recruit nominees to participate. aureus carriage, and they answered a questionnaire assessing risk factors for S. Participants were screened for HIV infection and S. Of 501 individuals recruited, 485 participated. From 2003 through 2005, we recruited adult drug users in Brooklyn, New York. We combined social-network analysis and molecular epidemiology to investigate Staphylococcus aureus among drug users. ![]()
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