Question

An experiment showed that, on average, cell phones have 18 times the number of infectious agents as a toilet handle. In the chain of infection, the cell phone would represent a
reservoir.
host.
portal of exit.
portal of entry.

Answer 1

Reservoir.

Rationale: A cell phone is an inanimate object that harbors and allows microbes to survive — functioning as a reservoir (fomite) in the chain of infection, rather than a host or a portal of exit/entry.