What is the significance of a positive acid-fast smear?
What is the significance of a positive acid-fast smear?
A normal result for an acid-fast bacteria smear is negative, meaning no bacteria were found in the sputum sample. A positive result means that bacteria were found and that you may have an infection. The smear is treated with a special acid-fast stain that can provide a preliminary test result in 24 hours.
Why is an acid-fast smear and culture ordered?
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.
Which disease is an acid fast bacilli smear?
Acid-fast bacillus (AFB) is a type of bacteria that causes tuberculosis and certain other infections. Tuberculosis, commonly known as TB, is a serious bacterial infection that mainly affects the lungs. It can also affect other parts of the body, including the brain, spine, and kidneys.
What is the stain used for acid-fast bacteria?
The primary stain used in acid-fast staining, carbolfuchsin, is lipid-soluble and contains phenol, which helps the stain penetrate the cell wall.
What is the meaning of acid-fast?
Acid fastness is a physical property that gives a bacterium the ability to resist decolorization by acids during staining procedures. This means that once the bacterium is stained, it cannot be decolorized using acids routinely used in the process.
What are two well known human diseases that are caused by acid-fast bacteria?
TUBERCULOSIS, LEPROSY AND OTHER DISEASES CAUSED BY ACID-FAST BACTERIA.
What is meant by acid-fast?
What is the result of acid fast staining?
A staining dye is added to the cells of the specimen and then washed in an acid solution. The cells are then examined under a microscope. If the cells retain the stain, this means mycobacterium are present. Mycobacteria are usually acid-fast, which means they hold onto the dye when washed in an acid solution.
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).
What is the purpose of acid fast staining?
The acid-fast stain is a laboratory test that determines if a sample of tissue, blood, or other body substance is infected with the bacteria that causes tuberculosis (TB) and other illnesses.
What are some diseases caused by acid-fast bacteria?
Tuberculosis, Leprosy and Other Diseases Caused by Acid-Fast Bacteria.
How is acid-fast bacilli treated?
The standard treatment for TB comprises an intensive phase with isoniazid, rifampicin, pyrazinamide, and ethambutol for 2 months, followed by a continuation phase that comprises the concomitant use of isoniazid and rifampicin for another 4 months. This standard treatment is highly effective for drug-susceptible TB.
