World TB Day will be observed Thursday, March 24, which makes this a good time to learn about this potentially serious infectious disease. In 2020, 7,174 cases of tuberculosis, or TB, were diagnosed in the U.S., according to the Centers for Disease Control and Prevention. Worldwide, 10 million cases were diagnosed, according to the World Health Organization. TB is caused by bacteria called Mycobacterium tuberculosis that spreads from person to person through tiny droplets released…