The correct answer is biological hazardous waste bags are red.
The main purpose of labeling is to separate hazardous waste from other waste bags like chemo waste, pharmaceutical, and other waste, which are in yellow, black, and blue, respectively.
When handling hazardous waste, make sure to know the waste laws, separate waste by type, and use proper waste containers, proper documentation.
Proper waste disposal protects the public, and also the waste handlers from infection, toxic effects, and injuries. Wastes in biological hazardous waste bags are blood and body fluids, cultures and stocks of infectious agents, discarded diagnostic samples, infected animals from the lab, body secretion, syringes, needles, scalpels, human body parts (organs and tissue), radioactive waste, lead, and batteries.