Pathogens and Infectious Diseases

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.