Microbiology

Four weeks after assisting in several calf deliveries, a farmer develops fever, weakness, muscle aches, and sweats. The fever rises in the afternoon and falls during the night. Brucella abortus is isolated. Which one of the three Brucella species is a possible bioterrorism agent and is best described by one of the following?

Commonly inhabits the canine respiratory tract and is an occasional pathogen for humans; strongly urease-positive

Gram-negative bipolar stained bacilli that cause diarrhea by means of a heat-stable enterotoxin, with abdominal pain that may be mistaken for appendicitis

Pits agar grows both in carbon dioxide and under anaerobic conditions, and is part of the normal oral cavity flora

Typically infects cattle, requires 5% to 10% carbon dioxide for growth, and is inhibited by the dye thionine

Questions

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