What does AFB test stand for?
Acid- Fast Bacilli (AFB) smear and culture are two separate tests always performed together at the MSPHL, Tuberculosis (TB) Unit. AFB smear refers to the microscopic examination of a fluorochrome stain of a clinical specimen.
What bacteria causes AFB?
Bacteria displaying acid fastness include:
- Genus Mycobacterium – M. leprae, M. tuberculosis, M. smegmatis, M. Avium complex, M. kansasii.
- Genus Nocardia – N. brasiliensis, N. cyriacigeorgica, N. farcinica, and N. nova.
What is sputum AFB?
A sputum stain for Mycobacteria is a laboratory test performed on a sample of your sputum, or phlegm. It’s also known as an acid-fast bacillus (AFB) stain or a tuberculosis (TB) smear. A doctor typically orders the test to determine if a person has tuberculosis (TB) or another type of mycobacterial infection.
What is AFB treatment?
An acid-fast bacteria (AFB) culture is done to find out if you have tuberculosis (TB) or another mycobacterial infection. Besides TB, the other main mycobacterial infections are leprosy and a TB-like disease that affects people with HIV/AIDS.
What is the color of acid-fast bacteria?
Acid Fast Strain Acid fast bacteria have a high content of mycolic acids in their cell walls. Acid fast bacteria will be red, while nonacid fast bacteria will stain blue/green with the counterstain with the Kinyoun stain.
What is Mycobacterium species?
Mycobacterium is a genus of Actinobacteria, given its own family, the Mycobacteriaceae. Over 190 species are recognized in this genus. This genus includes pathogens known to cause serious diseases in mammals, including tuberculosis (Mycobacterium tuberculosis) and leprosy (Mycobacterium leprae) in humans.
What can cause a positive AFB?
A positive AFB smear resulting from other bacteria that may have a positive AFB smear, such as Nocardia, Actinomyces, Rhodococcus, Legionella micdadei or cysts of Cryptosporidium species (12, 13).
Why mycobacterium is acid-fast?
The acid-fastness of Mycobacteria is due to the high mycolic acid content of their cell walls, which is responsible for the staining pattern of poor absorption followed by high retention. Some bacteria may also be partially acid-fast, such as Nocardia.
What does AFB test for?
Most samples that are submitted for acid-fast bacilli (AFB) testing are collected because the healthcare practitioner suspects that a person has tuberculosis (TB), a lung infection caused by Mycobacterium tuberculosis.
What is AFB culture?
An acid-fast bacilli (AFB) culture test detects AFB that retain the colour of a stain after an acid wash. This test is done to diagnose diseases caused due to Mycobacterium infection such as tuberculosis, leprosy, HIV-related infections, lung, skin and soft tissue diseases. AFB test also helps monitor the efficiency of treatment of these diseases.
What is AFB medical?
AFB stands for “ Acid Fast Bacilli ” and this term is used to describe rod shaped bacteria that can readily be stained with dye using a glass slide. The most well known bacilli are Mycobacterium tuberculosis , which is responsible for causing the highly infectious disease tuberculosis.
What does positive acid fast bacilli mean?
Mycobacteria are called acid-fast bacilli because they are a group of rod-shaped bacteria (bacilli) that can be seen under the microscope following a staining procedure where the bacteria retain the color of the stain after an acid wash (acid-fast).