Question

85 multiple choice 1 point what is the first step in the chain of infection that must be present for an infection to occur? mode of transmission portal of entry susceptible host infectious agent (pathogen) clear my selection

Explanation:

The chain of infection starts with an infectious agent (pathogen). Without a pathogen, there can be no infection. The other elements like mode of transmission, portal of entry, and susceptible host are important but come into play after the presence of the pathogen.

Answer:

D. Infectious agent (pathogen)