person-to-person transmission of hepatitis a virus in an urban area of intermediate endemicity: implications for vaccination strategies. | developing countries with an increasing hepatitis a disease burden may target vaccination to specific groups, such as young children, as an initial control strategy. to better understand transmission of hepatitis a virus in such countries, the authors prospectively studied household and day-care/school contacts of cases in almaty, kazakhstan. overall, by the time of identification of symptomatic index cases, half of transmission had already occurred, having been detected retrospectively. the odd ... | 2006 | 16339053 |