🦠Tuberculosis (TB) in Children 📘 Definition: Tuberculosis (TB) is a chronic infectious disease caused by the bacterium Mycobacterium tuberculosis, primarily affecting the lungs (pulmonary TB) but can also involve other organs (extrapulmonary TB) such as lymph nodes, spine, brain, and kidneys. TB spreads mainly through airborne droplets when an infected person coughs, sneezes, or speaks. Children are usually infected by contact with an adult TB case, especially in households.