If the doctor heard something in the lung and if you are not improving, I would get a chest x ray.
There is absolutely no way to say this is a viral infection or bacterial.
Atypical pneumonia can act just like this.
However, if you "feel fine" this goes against pneumonia.
Keep in mind, however, that younger healthier individuals can walk around with atypical pneumonia for some time before they get sick.
Lung sounds are either characteristic of pneumonia or not.
Something 'IN' the lung would indicated a problem.
Sounds that indicate bronchial inflammation to not indicate so much of a problem.
I would question your doctor on this.
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