Active infection: An active infection refers to an ongoing and symptomatic infection where the infectious agent is actively replicating and causing noticeable symptoms.
Transmission: Transmission refers to the transfer or spread of an infectious disease from one individual to another through various means such as direct contact, airborne particles, or contaminated objects.
Immune response: The immune response is the body's defense mechanism against foreign substances like pathogens. It involves various cells and molecules working together to eliminate infections.