In the medical and microbiology fields, laboratory tests are crucial for diagnosing severe bacterial infections. One of the most common and important tests for lung infections is the AFB test.
The test usually requires examining a sample of sputum coughed up from the lungs.
The 'Ziehl-Neelsen stain' is the most common method used in the AFB test.
A positive AFB smear indicates an active mycobacterial infection, usually TB.
The full form of AFB is Acid-Fast Bacillus.
The AFB smear and culture test is primarily used to detect Tuberculosis (TB). Mycobacterium tuberculosis, the bacteria that causes TB, is the most common and dangerous acid-fast bacillus. If a patient has a persistent cough, fever, and weight loss, doctors will take a sputum (mucus/phlegm) sample and run an AFB test to see if the TB bacteria are present.
A positive AFB test means that acid-fast bacteria were found in the sample, which strongly suggests that the person has an active Tuberculosis (TB) infection.
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