Serologic investigation of an outbreak of hepatitis A in a rural day-care center.
G A Gingrich,
S C Hadler,
H A Elder and
K O Ash
We studied an outbreak of hepatitis A in a day-care center ina rural community where less than 7 per cent of the populationpossessed anti-HAV. Serotesting for IgM specific antibody tohepatitis A virus identified 78 cases in center attendees, staff,and families. Thirty-five per cent of the center children wereseropositive. In children under age three anicteric infectionwas at least 17 times more frequent than icteric infection,but in older children and adults icterus was a predominant manifestationof the disease. Clinical suspicion should be high in any day-carechild with nausea, emesis, diarrhea, or arthralgia. The lowincidence of icterus in infected children suggested that outbreakreports reaching public health departments are likely to beincomplete and poorly indicative of outbreak magnitude. Thehigh frequency of intrafamilial transmission and anicteric infectionappeared to justify administration of immune serum globulinto household contacts of center children under age three whena day-care outbreak is detected.
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