multiple modes of hepatitis a virus transmission among methamphetamine users. | methamphetamine users are at increased risk of hepatitis a, but modes of transmission are unclear. the authors conducted a case-control study among methamphetamine users during an outbreak in iowa in 1997. twenty-eight reported, laboratory-confirmed, hepatitis a cases did not differ from 18 susceptible controls with respect to age, sex, or number of doses used. when compared with controls in multivariate analysis, case-patients were more likely to have injected methamphetamine (odds ratio (or) = ... | 2000 | 10909956 |