Mycobacterium tuberculosis is a bacterium that causes tuberculosis, a chronic infection usually of the lungs. Symptoms of tuberculosis may include fever, cough, and weight loss. Pulmonary tuberculosis can also develop in the long term when granulomas develop as a result of the infections in the respiratory tract. Grouped granulomas cause tubercles causing pulmonary tuberculosis.
A primary infection sometimes occurs without symptoms, any symptoms that may appear are general symptoms such as fever, fatigue, weight loss and night sweats. Also in a post-primary infection there are general symptoms that are not very typical, unless there is a clear localization in the foreground.