Textbook Question
Explain the action of the toxin of Clostridium tetani.
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21. Principles of Disease
Introduction to Pathogenic Toxins
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The route a pathogen uses to enter the human host is called the:
A
infectious dose
B
portal of exit
C
portal of entry
D
mode of transmission
Verified step by step guidance1
Understand the terminology related to pathogen transmission: 'infectious dose' refers to the number of organisms required to cause infection; 'portal of exit' is the route by which a pathogen leaves the host; 'mode of transmission' describes how the pathogen moves from one host to another.
Focus on the term that describes the route a pathogen uses to enter the human host, which is the initial point of entry for infection.
Recall that the 'portal of entry' is the specific site or route through which a pathogen gains access to the body, such as respiratory tract, gastrointestinal tract, skin, or mucous membranes.
Compare the options given and identify that 'portal of entry' correctly matches the definition of the route a pathogen uses to enter the host.
Conclude that the correct term for the route a pathogen uses to enter the human host is 'portal of entry'.
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