A biological hazard, or biohazard, is a biological substance that poses a threat to the health of living organisms, primarily humans. This could include a sample of a microorganism, virus or toxin that can adversely affect human health. A biohazard could also be a substance harmful to other living beings.
Immediate disposal of used needles into a sharps container is standard procedure.
NHS medics practice using protective equipment used when treating Ebola patients
A hazard is a potential source of harm. Substances, events, or circumstances can constitute hazards when their nature would allow them to cause damage to health, life, property, or any other interest of value. The probability of that harm being realized in a specific incident, combined with the magnitude of potential harm, make up its risk. This term is often used synonymously in colloquial speech.
Hard hats, an example of personal protective equipment, can protect against physical hazards
Construction workers at height without appropriate safety equipment
An active flame front of the Zaca Fire