Your doctor may use an acid-fast bacteria (AFB) stain test to see if you have a lung disease like tuberculosis (TB).In addition to showing tuberculosis, an AFB stain can also show if you have ...

Citric acid is commonly used in food preservation, cleaning products, and skin care. ... In cleaning products, citric acid kills any bacteria or virus that cannot survive at its pH of 3–6.

The same treatment is used to differentiate acid-fast bacteria from others. Nature - Staining of Bacteria and Certain Fungi. Skip to main content. Thank you for visiting nature.com.