pulmonary tb in the lungs is contagious it spreads when a person who has active tb breathes out air that has the tb bacteria in it and then another person breathes in the bacteria from the air an infected person releases even more bacteria when he or she does things like cough or laugh
An ideal bowel movement is medium brown, the color of plain cardboard. Stool that is pale or grey may be caused by insufficient bile output due to conditions such as gallstones, hepatitis, chronic pancreatitis, or cirrhosis. Bile salts from the liver give stool its brownish color.
Your stool can actually come out in a variety of colors. For example, black poop may indicate bleeding in the upper gastrointestinal tract, most likely the stomach. It could be caused by iron supplements, Pepto-Bismol, or (oddly enough) black licorice. Light-colored, white, or clay-colored poop usually means a lack of bile in your stool or bile duct obstruction.