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29120 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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29124 Medicine

A 38-year-old woman develops palpitations, weight loss, and heat intolerance. On examination, she has a mild tremor, an enlarged thyroid, and resting tachycardia. Biochemical tests confirm the diagnosis and she is started on methimazole. Which of the following is the most likely mechanism of this drug?

Ainhibition of iodine uptake
Binhibition of thyroidal organic binding and coupling reactions
Clowering serum calcium
Dadrenal suppression
Medicine
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