Bordetella bronchiseptica could be confused with the agent of whooping cough sin

Question

Bordetella bronchiseptica could be confused with the agent of whooping cough since it occasionally causes chronic respiratory tract infections in humans, but has less intensive symptoms (rhinitis and cough). It is best described by which of the following?

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

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

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

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

e. Typically is found in infected animal bites in humans and can cause hemorrhagic septicemia in animals

Explanation / Answer

The best answer is ‘a’. It affects respiratory tract of dogs and other animals. Bordetella bronchiseptica gives a positive reaction in the spot urease test or in the tube test. Hence urea positive, but urea negative strains are also identified.

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