Following a county fair, 160 persons complained of gastrointestinal symptoms. Symptoms included diarrhea (84 percent), abdominal cramps (96 percent), nausea (84 percent), vomiting (82 percent), body aches (50 percent), fever (60 percent; median body temperature = 38.3°C); median duration of illness 6 days (range 10 hr to 13 days).

Following a county fair, 160 persons complained of gastrointestinal symptoms. Symptoms included diarrhea (84 percent), abdominal cramps (96 percent), nausea (84 percent), vomiting (82 percent), body aches (50 percent), fever (60 percent; median body temperature = 38.3°C); median duration of illness 6 days (range 10 hr to 13 days).

In Situation 25.1, fecal samples should be cultured for all of the following EXCEPT


A) Salmonella enterica.
B) Shigella spp.
C) Campylobacter jejuni.
D) enteropathogenic Escherichia coli.
E) Giardia lamblia


Answer: Giardia lamblia


In Situation 25.1, fecal samples were found to be negative when cultured. The next step in diagnosing the cause of illness would be


A) to begin antibiotic therapy.
B) blood cultures.
C) microscopic examination of feces for oocysts.
D) microscopic examination of feces for viruses.
E) muscle biopsy.


Answer: microscopic examination of feces for oocysts


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