Hi, I have read your query and understand your concern. Mycobacterium kansasii infection is quite similar to TB or tuberculosis caused by mycobacterium tuberculosis. Their symptoms are also quite similar. Patient infected with Mycobacterium kansasii develops symptoms like cough and coughing up sputum. Some people develop blood tinged sputum. Few people have weight loss and find it difficult to breath.Some other symptoms are fever and sweating at night. It tends to infect people with previous damaged lungs due to other conditions like COPD, TB, bronchiectasis, etc. It can also infect people with weak immune system like in HIV/AIDS. Your doctor might have told its dangerous as it can spread to brain causing meningitis as well. But you need not worry so much. Mycobacterium kansasii can respond well to combined drug treatment of rifampicin, ethambutol and isoniazid. If its resistant to rifampicin, then other drugs are used. As your doctor has referred your husband to TB clinic, they will take care of all his tests and drug treatment.