What do we call substances such as bacteria that invade the body?

Name: What do we call substances such as bacteria that invade the body?
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Quizplus · Accepted Answer

Antigens are substances that invade the body and can trigger an immune response. This includes bacteria, viruses, and other pathogens.

Note: Allergens are substances that can cause an allergic reaction, but they may not necessarily invade the body like antigens do. Immuno-agents and anti-infectious agents are not commonly used terms in immunology.

What Do We Call Substances Such as Bacteria That Invade