Is Nontuberculous Mycobacterial (NTM) infection contagious?

Nontuberculous mycobacterial (NTM) infection is not contagious in the traditional sense; it does not typically spread from person to person through coughing, sneezing, or direct contact, unlike Mycobacterium tuberculosis which causes tuberculosis. These bacteria exist naturally in the environment, such as in soil and water, and individuals become infected upon exposure from these environmental sources [3]. Therefore, in most cases, there is no need to worry about transmitting the infection to family members or friends.

How does NTM infection occur?

NTM infection occurs when a person inhales these bacteria from the environment or when they enter the body through other means. These bacteria are known as "acid-fast bacteria" (AFB) [1]. Although they do not transmit between humans, environmental exposure to these microorganisms is the primary route of infection. These infections can cause a variety of diseases, most often affecting the lungs, but they can also affect other parts of the body [3].

High-Risk Groups

While anyone can contract NTM, certain groups are more susceptible to infection and the development of the disease. These include individuals with weakened immune systems, such as those with HIV or those receiving immunosuppressive therapies [1]. People with chronic lung diseases, such as cystic fibrosis or chronic obstructive pulmonary disease (COPD), may also be more prone to NTM lung infections [3]. Young children and the elderly may also be more susceptible due to their weaker immune systems.

Symptoms of NTM Infection

Symptoms of an NTM infection can vary depending on the part of the body affected. If the infection is in the lungs, symptoms may include a persistent cough, weight loss, cough with blood or mucus, weakness or fatigue, fever and chills, night sweats, and loss of appetite [3]. These symptoms may be similar to those of other lung diseases, making diagnosis difficult at times. If you are experiencing these symptoms, it is important to consult a physician for necessary testing.

Diagnosis and Treatment

To diagnose an NTM infection, a doctor may order tests such as acid-fast bacilli (AFB) tests, which involve examining sputum samples under a microscope or culturing them in the laboratory [1]. Culture results may take several weeks to appear, which can delay the final diagnosis [1]. Once diagnosed, treatment is typically managed using a combination of antibiotics, and the treatment duration may be long to ensure the infection is eradicated and to prevent recurrence [3]. It is crucial to adhere to the treatment plan prescribed by the doctor even if you feel better, as stopping treatment early can lead to a return of the infection or the development of antibiotic resistance.

For more information on the challenges of diagnosis and treatment, you can visit our article on Nontuberculous Mycobacterial (NTM) Infection: Diagnosis and Treatment Challenges (Arabic).

Medical references

• Mycobacterial Infections
• Acid-Fast Bacillus (AFB) Tests