Infectious Diseases - 2 Answers
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1 :
By the time the doctors have found the fluid in your lungs, it become hard to flush out the toxins. The lung's air sacs would have been filled with so much fluid that it'd be impossible to drain it.
2 :
The bacteria do not grow well in laboratory conditions, it often takes several weeks for colonies to show on lab media (petri dish with agar). Unless serious decontamination procedures are done and specialized agar is used, the normal flora of the sputum sample will completely overgrow the mycobacteria. These processes are time consuming and expensive, and require costly equipment to prevent those working on the cultures from catching the disease themselves
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