Nosocomial hepatitis A transmission by an adult patient with diarrhea.

Hepatitis A occurred in five registered nurses, a licensed practical nurse, and a recently discharged patient at a community hospital; one of these seven was asymptomatic. All had been exposed to a woman with confirmed hepatitis A who had undergone elective cholecystectomy and who had had vomiting, diarrhea, and fecal incontinence during the eight days before onset of jaundice. Of the 107 hospital workers identified as having at least some exposure to the source patient, 58 (54.2 percent) had no pre-existing antibody to hepatitis A virus (anti-HAV) and were considered susceptible. Six persons, including the five clinically ill registered nurses, had IgM-specific anti-HAV. The infection attack rate was 5.6 percent for all exposed hospital workers but 10.3 percent for the 58 who were serosusceptible. Risk of infection was highest for persons with documented or probable contact with the source patient and for registered nurses. Among hospital personnel, the prevalence of anti-HAV increased with age but varied inversely with socioeconomic status. Hospital personnel and patients may be at risk for hepatitis A infection when exposed to patients who are in the prodromal stage of hepatitis A. Vomiting, diarrhea, and fecal incontinence may increase the risk of transmission.