The chain of infection involves:
a. infectious agent in sufficient numbers.
b. mode of transmission and mode of entry.
c. a susceptible host.
d. all of the above.
d
The development of infection can be thought of as a
chain of events. Each event is a link in the chain and must
occur sequentially for an infection to develop. The presence
of all the following elements is necessary for an infection
to occur: infectious agent; reservoir; portal of exit; mode of
transmission; portal of entry to the new host and a susceptible host.
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