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21st August 2023

A 4-year-old boy presents with a cough that has persisted for 3 weeks

A 4-year-old boy presents with a cough that has persisted for 3 weeks. His mother mentions that the cough is often followed by vomiting, and sometimes the boy struggles to breathe after a coughing fit. His immunisations are up to date.

What is the most appropriate diagnostic test?

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