July 13, 2010

MRCP 1 Question 15

A pet shop owner develops a febrile illness characterized by pneumonia and systemic symptoms.

Chlamydia is isolated from a clinical specimen.

The most likely diagnosis is
a) Lyme disease
b) brucellosis
c) infective endocarditis
d) listeriosis
e) psittacosis

The correct answer is E


Psittacosis is primarily an infectious disease of birds caused by the bacterium Chlamydia psittaci.

Transmission from infected birds results in a relatively rare febrile illness characterized by pneumonia and systemic symptoms A flu -like illness can also occur.

Almost any bird can harbor this bacterium in their excreta, tissues, feathers, and secretions, but parrots, parakeets, and budgerigars are the most common.

Psittacosis is considered an occupational disease of pet shop owners. Psittacosis is almost always transmitted to humans by the respiratory route. Average incubation is 7-14 days.

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