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MRCPCH AKP Practice Questions - MRCPCH Applied Knowledge In Practice (AKP) Exam

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A 6-week-old infant presents with a 4-day history of coryza followed by paroxysmal coughing fits ending in vomiting, with episodes of apnoea and colour change. The infant is afebrile. A characteristic inspiratory whoop is not heard. Which single investigation is most likely to confirm the diagnosis at this stage?
Correct Answer:
Per-nasal swab for Bordetella pertussis PCR

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