Which term describes the entry route of a pathogen into a new host?

Which term describes the entry route of a pathogen into a new host?

• A. Portal of exit
• B. Portal of entry
• C. Reservoir
• D. Modes of transmission

Answer: (B)

The entry route a pathogen uses to get into a new person is its portal of entry. This term names the specific path the organism takes to enter the body—such as inhalation into the respiratory tract, ingestion into the gastrointestinal tract, or through intact or broken skin and mucous membranes. The portal of entry matters because the initial site of entry can influence how the infection starts and what defenses the body mobilizes first. This is different from the portal of exit, which describes how the pathogen leaves a host (for example, via coughing, stool, or blood). It’s also distinct from the reservoir, which is the place where the pathogen lives and multiplies (or persists) in the environment or within an animal or person. Finally, modes of transmission cover how the pathogen moves from one host to another (airborne, contact, vector-borne, etc.), which can involve more than one portal of entry along the chain of transmission.

The entry route a pathogen uses to get into a new person is its portal of entry. This term names the specific path the organism takes to enter the body—such as inhalation into the respiratory tract, ingestion into the gastrointestinal tract, or through intact or broken skin and mucous membranes. The portal of entry matters because the initial site of entry can influence how the infection starts and what defenses the body mobilizes first.

This is different from the portal of exit, which describes how the pathogen leaves a host (for example, via coughing, stool, or blood). It’s also distinct from the reservoir, which is the place where the pathogen lives and multiplies (or persists) in the environment or within an animal or person. Finally, modes of transmission cover how the pathogen moves from one host to another (airborne, contact, vector-borne, etc.), which can involve more than one portal of entry along the chain of transmission.