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Word

infect

verb C1
/ɪnˈfɛkt/

Meanings

verb

to pass germs into a person, animal, or plant and cause disease

infect: to pass germs into a person, animal, or plant and cause disease
verb

to spread a harmful influence or feeling through a group or situation

infect: to spread a harmful influence or feeling through a group or situation

Definition

To infect means to pass a disease-causing germ to a person, animal, or plant, making them ill.

To infect is to cause a person, animal, or plant to become ill by introducing harmful germs such as bacteria or viruses. It can also mean to spread those germs to others through contact, air, or contaminated surfaces. More broadly, it can describe a harmful influence spreading through a group or system, such as fear or corruption.

Examples

  • If you don’t disinfect the equipment properly, you could infect the next patient.
  • She worried that her cough might infect her colleagues during the conference.
  • They traced the outbreak to a single contaminated tap that had infected dozens of residents.
  • I don’t want to infect my grandparents, so I’m staying home until my symptoms pass.

Common mistake

Learners sometimes confuse "infect" with "affect" and say "The virus affected him" when they mean "The virus infected him."