Usage Note
Infectar is used for biological infection (a pathogen infecting a host) and metaphorically for computer viruses (infectar un ordenador). The reflexive infectarse means 'to become infected.' It is a regular -ar verb; the related adjective infectado and noun infección follow the same root.
Examples
"El virus puede infectar a personas mayores fácilmente."
Natural Translation
The virus can infect elderly people easily.

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