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1646 Microbiology

An outbreak of gastroenteritis occurred in a youth group camp. Water at the camp, which was not chlorinated or filtered, was obtained from a spring on the premises. The farmland near the camp was grazed by cattle and sheep. Run-off from the pasture entered the camp spring. The isolated microorganism required an atmosphere containing reduced oxygen and increased carbon dioxide for its growth. In most cases, the gastroenteritis was self-limiting. Those requiring antibiotic treatment responded to erythromycin. Which is the most likely causative agent?

ACampylobacter jejuni
BEnteroinvasive Escherichia coli (EIEC)
CEnteropathogenic Escherichia coli (EPEC)
DVibrio cholerae
Microbiology
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1647 Microbiology

A truck driver was involved in a serious accident and received second and third degree burns over his body. He was placed in the burn unit and, on his twelfth day of his admission, developed a wound infection with a bluish-green exudate. Treatment with chloramphenicol and tetracycline was unsuccessful. A gram-negative, motile organism was isolated that was oxidase-positive, did not ferment lactose, sucrose, or glucose, but grew on MacConkey’s agar and produced a fruity aroma on that medium. Which of the following organisms was most likely isolated?

ACandida albicans
BClostridium perfringens
CEscherichia coli
DPseudomonas aeruginosa
Microbiology
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