Breathe in airborne droplets from a person with active pulmonary TB
Spend prolonged time in close contact with someone with active TB
Live or work in crowded, poorly ventilated indoor spaces with TB exposure
Be exposed in healthcare settings without proper respiratory protection
Have a weakened immune system that makes infection more likely after exposure
Share living spaces with someone who has untreated or contagious TB
Be born to a mother with active TB, or be exposed during birth in rare cases
Ingest unpasteurized dairy products contaminated with bovine TB, where it occurs
Handle infected animals or animal products in settings where bovine TB is present