INFECTIOUS AGENT - Agent capable of causing infection (Bacteria, virus, protozoa, fungi), RESERVOIR - Place where the pathogen can thrive and reproduce (human body, animals, insects, food, water, inanimate objects), PORTAL OF EXIT - A way for a pathogen to exit the reservoir (skin, respiratory, urinary, GI, or reproductive tract), MODE OF TRANSMISSION - DIRECT (body-to-body). INDIRECT (Transferred by fomite or vector, or spread by droplet or airborne), PORTAL OF ENTRY - A way for the pathogen to enter the host (skin, respiratory, urinary, GI, or reproductive tract), SUSCEPTIBLE HOST - Any person who cannot resist the pathogen,

INFECTION CYCLE

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