A community-wide outbreak of hepatitis A in a religious community: impact of mass administration of immune globulin

Area of Science:

• Epidemiology
• Public Health
• Immunology

Background:

• Community-wide hepatitis A outbreaks are challenging to control.
• A significant outbreak occurred in a religious community between July 1988 and May 1989.

Purpose of the Study:

• To evaluate the impact of mass immune globulin administration on controlling a hepatitis A outbreak.
• To determine the efficacy of immune globulin in a community setting.

Main Methods:

• Immune globulin (0.02 ml/kg) was administered to 65% of residents during a 5-day campaign.
• Hepatitis A incidence was monitored before and after the intervention.

Main Results:

• New hepatitis A cases among recipients ceased two weeks post-campaign.
• Community incidence dropped from 9.6 cases/week to 1.9 cases/week.
• Immune globulin showed 88.9% efficacy in those under 20 over seven months.

Conclusions:

• Mass immune globulin administration was partially effective in controlling the community-wide hepatitis A outbreak.
• The intervention significantly reduced disease incidence.
• Further monitoring is needed to confirm long-term control.