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MAC-associated lymphadenitis is diagnosed with a positive finding of the bacteria in the culture of lymph node cells. A CT scan might be done to help determine the sites of the body that the MAC infection has affected. Urine, stool, liver, and bone marrow cultures may also be used to diagnose MAC infections. (2)ĭisseminated MAC infections are diagnosed with cultures of blood and lymph node cells that are tested for the presence of MAC bacteria.
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A staining test of a sputum sample called an acid-fast bacillus test may also be performed to help identify the bacteria under a microscope. It may take several days to see if the sample tests positive for pulmonary MAC. The test involves placing cells from the sputum sample in an environment that encourages bacteria to grow. One of the laboratory tests will include a culture of sputum, or mucus spit up from the lungs. Since symptoms are similar to other types of infections, various causes will need to be ruled out.
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(1)Ī doctor will diagnose MAC infections based on a number of tests, including a physical examination, lab test results, X-rays, and CT scans. But many genes are involved in the immune response, and researchers have yet to identify a single gene responsible for MAC infections.įinally, elderly women are at an elevated risk of getting pulmonary MAC infections. Such a variant could make some people more likely to get an infection than others. In these instances, scientists believe that there is a variation in the gene or genes involved in the immune response. While mycobacterium avium complex infections are not inherited - a person must be exposed to one of the associated types of bacteria in order to get sick - there have been several reports of more than one family member becoming ill with a MAC infection. In people with HIV, MAC infections are more likely to occur in those with CD4 counts less than 50 cells per cubic millimeter. Most people who get MAC infections are those living with HIV/AIDS, certain cancers, and lung diseases like chronic obstructive pulmonary disease, cystic fibrosis, or bronchitis. The biggest risk factor is having a compromised immune system. So while many people have MAC in their bodies, it will only cause an infection in those with a very weakened immune system. It is an opportunistic infection, meaning it occurs when a pathogen takes advantage of a person without a normally functioning immune system. Finding a Cure for HIV: What Is the Future?