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This is Dr. David. I am reviewing your question now and will be with you momentarily.
I am sorry your husband are having these symptoms.
he should get a chest CT Scan of his chest which is much more detailed than a chest xray
he should get a sputum culture of the thick phlegm he coughs up to check for bacteria or fungus in the lungs.
some bacterial infections can be resistant to certain antibiotics.
doctors can be resistant to use CT scans in the UK because of their cost, but they are much much more detailed in the lungs compared to a chest xray.
chest xrays are from 1940s sort of technology.
sputum cultures are not that expensive and should be performed for him
let me know if you have questions.