Contract = you receive the virus/illness. "You will contract corona virus if you don't wear a mask" Infect = you give the virus to someone else. "Don't stand near sick people, they could infect you." "Don't come near me, I have a virus, I could infect you." "I became infected" and "I contracted the virus" have the same meaning

Deanne's answer is correct. Contract = you receive it; Infect = you give it.

Hi~ contract is (to get any kind of disease... can be virus/cancer/etc) infect- usually use to talk about bacteria or virus that enter the body to infect- give the disease to someone "got infected"- got the disease from someone/something