| prevalence and risk factors of hepatitis a among blood donors in qazvin, central iran. | introduction: the hepatitis a virus (hav) is a major global health problem, especially in developing countries. althrough children aged 5-14 years are the most infected age group, all age groups are equally affected in an hav epidemic. the aim of this study was to determine the prevalence and related risk factors of hav among blood donors in qazvin, central iran. methods: a cross-sectional study was performed in april 2008 on a total of 351 blood donors aged 17 to 60 years. information on demogr ... | 2011 | 21373737 |