As defined by Wikipedia, biological hazards, also known as “biohazards,” refer to biological substances that pose a threat to the health of both humans and animals. A biohazard threat comes from a variety of sources: medical waste, crime scenes, human remains from death scenes, when sewage backs up into homes or businesses. In addition, biohazards can come from toxins created from biological sources like molds, bacteria, and viruses. All of these situations are considered biohazards because they can make you sick. And not just a little sick either. Biohazards can kill you!

The term biohazard and its associated symbol warns people of potential threat to health. That way people exposed to them will know to take precautions. All biohazard clean up jobs are dangerous. And they require special equipment and training to clean and sanitize the area properly to remove the threat.