Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Pathogens are microorganisms, such as bacteria, viruses, or fungi, that can cause diseases in humans, animals, or plants. Infectious diseases are illnesses caused by these pathogens that can be transmitted from one organism to another.
Related terms
Immune System: The body's defense system against pathogens and infectious diseases.
Antibiotics: Medications used to treat bacterial infections.
Vaccines: Substances that stimulate the immune system to protect against specific pathogens.
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