In the chain of infection, which component describes the path through which a pathogen enters a new host?

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Multiple Choice

In the chain of infection, which component describes the path through which a pathogen enters a new host?

The main idea is how a pathogen gains access to a new person. The route through which it enters the body is called the portal of entry. This can be through broken skin, mucous membranes such as those in the nose or mouth, the respiratory or gastrointestinal tracts, the conjunctiva, or via devices and procedures (like catheters) that bypass normal barriers. Recognizing portals of entry helps explain how infections start and why preventing entry points is a key part of infection control. This differs from how the pathogen leaves its current host—the portal of exit—which includes coughing, sneezing, wound drainage, or fecal discharge. It also differs from the reservoir, which is where the organism lives and multiplies (humans, animals, or the environment), and from the mode of transmission, which is the method by which the pathogen is carried to a new host (direct contact, droplets, airborne, vector-borne). So the described concept is the portal of entry—the entrance route into the body of a new host.

The main idea is how a pathogen gains access to a new person. The route through which it enters the body is called the portal of entry. This can be through broken skin, mucous membranes such as those in the nose or mouth, the respiratory or gastrointestinal tracts, the conjunctiva, or via devices and procedures (like catheters) that bypass normal barriers. Recognizing portals of entry helps explain how infections start and why preventing entry points is a key part of infection control.

This differs from how the pathogen leaves its current host—the portal of exit—which includes coughing, sneezing, wound drainage, or fecal discharge. It also differs from the reservoir, which is where the organism lives and multiplies (humans, animals, or the environment), and from the mode of transmission, which is the method by which the pathogen is carried to a new host (direct contact, droplets, airborne, vector-borne). So the described concept is the portal of entry—the entrance route into the body of a new host.

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