To infect something is to cause it to get sick or to have something bad happen to it. When you infect your computer with a virus, you're causing it to get infected with a virus.

  • The virus infected the computer system.

  • He was infected with the virus at the hospital.

Definition of infects


contaminate with a disease or microorganism




affect in a contagious way


communicate a disease to


corrupt with ideas or an ideology

Nearby Words

infects Pronunciation in a video (3)

Example Sentences for infects

  • 1

    Episodes are triggered by febrile illness, infection, or fasting.

  • 2

    The virus may have already crossed the placenta to infect the fetus.

  • 3

    Feral populations can also pass on transmissible infections to domestic herds.

  • 4

    It infects the remainder of the pages.

  • 5

    The infection is preventable by vaccination.

  • 6

    The infection is very contagious.

  • 7

    The origin of the infection is unknown.

  • 8

    It is the result of an untreated syphilis infection.

  • 9

    Multiple infections of the erythrocyte are uncommon.

  • 10

    Infection is related to the ingestion of seafood.