![]() ![]() When a virulent pathogen enters an immune-compromised person, however, infection generally followsĪ person who can get sick when exposed to a disease-causing pathogen. Infection does not occur automatically when the pathogen enters the body of a person whose immune system is functioning normally. The final link in the chain of infection is a susceptible host, someone at risk of infection. The route through which the pathogen enters its new host Pathogens often enter the body of the host through the same route they exited the reservoir, e.g., airborne pathogens from one person’s sneeze can enter through the nose of another person. Infectious agents get into the body through various portals of entry, including the mucous membranes, non-intact skin, and the respiratory, gastrointestinal, and genitourinary tracts. □Interaction by medical procedure (catheter).
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