Results
Epidemiologic Investigation
Multiple families with children attended the house party; no other common exposures were
identified among primary cases during the exposure period. Four children who were present at
the house party tested positive for STEC O157 and had confirmed primary cases; one child who
did not attend the house party but later had contact with a confirmed case tested positive for
STEC O157 and had a confirmed secondary case. Two (40%) of the ill persons were female and
three (60%) were male. Individuals with confirmed STEC infection ranged in age from 2 to 3
years (median: 2 years).
3
The most common symptom was diarrhea, which was experienced by all (100%) confirmed
cases [Table 1]. Bloody stool and vomiting were also reported. Three (60%) children were
hospitalized, and two (40%) developed hemolytic uremic syndrome (HUS). The incubation
period for primary confirmed cases ranged from three days to five days (median: 4.5 days)
[Figure 1]. Four probable secondary cases were identified during case-patient interviews.