Q fever in maritime Canada

Area of Science:

• Infectious Diseases
• Public Health
• Clinical Medicine

Background:

• Q fever incidence in Canada was historically low, with only nine cases reported in the two decades preceding 1978.
• The study period (August 1979 to January 1981) saw a notable increase in Q fever diagnoses in the Maritime provinces.

Observation:

• Six epidemiologically unrelated patients were diagnosed with Q fever via serology.
• None of the patients reported animal exposure, challenging typical transmission assumptions.
• Clinical presentations varied, including five cases of pneumonia and one of chronic Q fever with suspected endocarditis.

Findings:

• Pneumonia cases presented either as acute lower respiratory tract infections or nonresolving pulmonary infiltrates.
• Treatment responses varied, with most pneumonia cases responding to erythromycin and one requiring tetracycline.
• The chronic Q fever case exhibited cryoglobulinemia and immune complex disease, indicating a severe manifestation.

Implications:

• These findings suggest Q fever should be considered in the differential diagnosis of atypical pneumonias in Canada.
• The lack of animal exposure in these cases warrants further investigation into potential transmission routes.
• Increased awareness and diagnostic consideration of Q fever are crucial for timely patient management.