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Subst Use Misuse. 2012 Feb;47(3):244-53. doi: 10.3109/10826084.2011.632465. Epub 2011 Dec 2.

Intraurban mobility and its potential impact on the spread of blood-borne infections among drug injectors in Tijuana, Mexico.

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  • 1School of Medicine, University of California San Diego, La Jolla, California 92093, USA.


We explored intraurban mobility of Tijuana, Mexico, injection drug users (IDUs). In 2005, 222 IDUs underwent behavioral surveys and infectious disease testing. Participants resided in 58 neighborhoods, but regularly injected in 30. From logistic regression, "mobile" IDUs (injecting ≥3 km from their residence) were more likely to cross the Mexico/U.S. border, share needles, and get arrested for carrying syringes-but less likely to identify hepatitis as an injection risk. Mobile participants lived in neighborhoods with less drug activity, treatment centers, or migrants, but higher marriage and home ownership rates. Mobile IDUs should be targeted for outreach and further investigation. The study's limitations are noted.

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