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An outbreak of hepatitis A in an institution for the mentally retarded
Abstract:
From December 1977 until April 1978 a hepatitis A outbreak occurred in an institution for the mentally retarded. The institution housed 311 residents and had a staff of 308. The outbreak was studied by enzyme-linked immunosorbent assays for hepatitis A antigen and antibodies, and by liver function tests in serum. When the investigations started, 13 residents and one staff member were ill and already seropositive; 34 of the 182 residents that were seronegative at that time and 12 of the 223 seronegative staff members subsequently developed disease. Out of the 60 cases 32 were asymptomatic; 19 cases with jaundice were seen. Normal human immunoglobulin was administered to a large part of the seronegative group, but the effect is difficult to interpret as the immunoglobulin was often given after the presumed time of infection and failed to protect. Elevated liver enzyme levels were demonstrated in 38 of 60 patients.
Insights
A hepatitis A outbreak in a residential institution affected 60 individuals, with many cases being asymptomatic. Immunoglobulin administration showed limited protective effect due to late timing.
Area of Science:
- * Hepatology
- * Infectious Diseases
- * Public Health
Background:
- * Hepatitis A virus (HAV) outbreaks can occur in institutional settings.
- * Institutions for individuals with intellectual disabilities are vulnerable to infectious disease transmission.
- * Understanding transmission dynamics and intervention effectiveness is crucial for public health.
Purpose of the Study:
- * To investigate a hepatitis A outbreak in a residential institution.
- * To determine the seroprevalence and clinical presentation of hepatitis A cases.
- * To evaluate the efficacy of immunoglobulin administration during the outbreak.
Main Methods:
- * Enzyme-linked immunosorbent assays (ELISA) for hepatitis A antigen and antibodies.
- * Serum liver function tests.
- * Retrospective analysis of case data and intervention timing.
Main Results:
- * The outbreak involved 60 cases among 311 residents and 308 staff members.
- * 32 cases were asymptomatic, and 19 presented with jaundice.
- * Immunoglobulin administration was often delayed, limiting its protective impact.
Conclusions:
- * Hepatitis A outbreaks can spread widely in institutional settings, including asymptomatic cases.
- * Timely intervention is critical for the effectiveness of prophylactic measures like immunoglobulin.
- * Public health strategies should focus on early detection and prompt treatment during outbreaks.