Usage Note
Infectado functions as a past-participle adjective and takes estar: la herida está infectada (the wound is infected). The medical verb is infectar(se); the causative is infectar (to infect something), the reflexive infectarse (to become infected). Don't confuse with infestado (infested with pests).
Examples
"El corte en su mano estaba infectado."
Natural Translation
The cut on his hand was infected.

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