Biological hazards are substances that pose a risk to living organisms, including humans, animals, and plants. There are several synonyms for the term biological hazard, including biohazard, microbial agents, infectious agents, microbial hazards, pathogenic organisms, and environmental pathogens. These terms are often used interchangeably, and all describe substances that can cause disease or harm to living organisms. Biological hazards can include viruses, bacteria, fungi, and toxins created by living organisms, and can spread through contact with contaminated surfaces, air, water, or food. Proper handling and disposal of biological hazards is crucial to prevent the spread of disease and protect public health.