Features of hepatitis E.

aPerson-years (py) at risk for primary infection or for reinfection were calculated based on the estimated exposure rate of 38%, according to the anti-HEV seroprevalence (47%) in a subpopulation of 14,069 subjects in the area, adjusted by sex and age according to the 2007 demographic data of the general inhabitants of the city.
bFor the calculation of the expected number of cases (parenthesis), it was assumed that the sensitivity for the detection of hepatitis E attributed to primary infection was 100%, the sensitivity of rising IgG marker for detection of the cases was 52.4% (43/82), and the expected proportion of cases due to reinfection in the series was 17.3% (17.2/99.2).
cPrimary infection vs reinfection.