For pathogenic agents to cause diseases and illnesses in others - it is necessary that they leave their reservoirs. The _____ link in the chain of infection is the portal of exit - or the point at which agents leave their reservoirs.

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1. For pathogenic agents to cause diseases and illnesses in others - it is necessary that they leave their reservoirs. The _____ link in the chain of infection is the portal of exit - or the point at which agents leave their reservoirs.