Chain of Infection
Chain of Infection : A process that begins when an infectious agent (e.g., bacteria. Virus, parasite, or fungus) leaves its reservoir or host (humans, animals, plants, or the general environment) through a portal of exit (body orifices, bodily fluids, tissue, excreta, secretions), and is conveyed by some mode of transmission (direct, indirect, airborne), then enters through an appropriate portal of entry to infect a susceptible host (compromised individuals. Susceptibility factors include age, pre-existing disease, lifestyle factors, stress, medication, etc)
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