The risks of transmission of acute hepatitis A and B virus infection in an urban centre.
In a large urban centre of a developed nation, 63 household contacts of 20 index cases with acute hepatitis A virus infection and 95 household contacts of 29 index cases with acute hepatitis B virus infection were prospectively followed for 2 years to document the risk of acquiring acute hepatitis from the index case. Twenty-one of 63 (33%) hepatitis A virus household contacts had serologic evidence of previous hepatitis A virus infection on the initial serum sample. Of the remaining 42 susceptible individuals, 22 (52%) were or became IgM anti-HAV positive within 6 months of the diagnosis in the index case. With respect to hepatitis B virus infection, 18/95 (17%) household contacts had serologic evidence of previous hepatitis B virus infection on the initial serum sample. Of the remaining 77 susceptible individuals, four (5%) had or developed serologic evidence of acute hepatitis B virus infection (IgM anti-hepatitis B core antigen positive) during the 2 years of follow up. In three of these four individuals, acquisition of hepatitis B virus was apparent within 6 months of the diagnosis in the index case. The results of this study indicate that in this urban centre, the risk of acquiring acute hepatitis A virus infection from index cases within the household is approximately 10 times greater than that for acute hepatitis B virus infection. These results support the need for continued passive and/or active immunization against hepatitis A and B virus infection in susceptible household contacts.
Minuk
G Y
GY
Department of Medicine, University of Manitoba, Canada.
Ding
L X
LX
Hannon
C
C
Sekla
L
L
D000328:Adult; D000368:Aged; D018562:Disease Transmission, Infectious; D005260:Female; D006506:Hepatitis A / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission*; D006509:Hepatitis B / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission*; D006512:Hepatitis B Core Antigens / Q000097:blood; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood; D008297:Male; D008350:Manitoba / Q000453:epidemiology; D009679:Nuclear Family; D012307:Risk Factors; D014505:Urban Population
D006512:Hepatitis B Core Antigens; D007075:Immunoglobulin M