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Lung cancer screening — MCCQE Part 1 MCQ

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EasyPreventive MedicineLung cancer screeningMCCQE Part 1

Public health identifies a healthy 32-year-old as a susceptible household contact of a person with laboratory-confirmed hepatitis A. The last exposure was 6 days ago. She has no chronic liver disease, immunocompromising condition or vaccine contraindication. What is the most appropriate post-exposure prophylaxis?

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Correct answer: E — Give one dose of monovalent hepatitis A vaccine now and complete the series later

Hepatitis A vaccine is the preferred post-exposure agent for a healthy susceptible person aged at least 6 months. Give one dose as soon as possible, preferably within 14 days of the last exposure, and arrange the later dose needed to complete the product-specific series. Immunoglobulin is added or substituted in defined situations such as immunocompromise, chronic liver disease, age 60 years or older in some close contacts, vaccine contraindication, infancy under 6 months or vaccine unavailability. None applies here. Antibiotics do not prevent hepatitis A, and waiting for symptoms forfeits preventive benefit.

Reference: Canadian Immunization Guide, Hepatitis A Vaccines: https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-4-active-vaccines/page-6-hepatitis-a-vaccine.html