Our expert says:
Any persistant cough for more than 2 weeks needs further examination. If the doctor thinks there could be a chance of TB he should do a sputum test or TB PCR blood test. I think sending sputum away for MCS is anyway a good idea. Ask them to refer him to a pulmonologist for a second opinion and further tests like lung function tests (Chronic coughing can also be a sign of heart disease or even gastric reflux.)
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