What term describes disease-producing microorganisms such as bacteria, viruses, or fungi?

• A. Toxins
• B. Pathogens
• C. Contaminants
• D. Allergens

Answer: (B)

Disease-causing microorganisms are called pathogens. This term covers bacteria, viruses, and fungi because each of these groups has the potential to invade a host and disrupt normal bodily functions, leading to illness. Toxins are poisons produced by some microbes, so they’re harmful substances rather than the organisms themselves. Contaminants are any unwanted substances that degrade safety or quality, not specifically disease-causing organisms. Allergens trigger immune responses but do not typically cause infectious disease. In the real world, you’ll encounter pathogens like bacteria, viruses, and fungi in water, air, and food, which is why understanding this term helps in protecting public health through proper sanitation, disinfection, and monitoring.