MacBook virus notifications

The "you have a virus; click here" phishing scams can also arrive in the form of e-mail messages, in which case the notification at the top right of the screen will be from Mail rather than from the Web site itself.

In either case, the threat is from the people who sent you the message claiming that your computer has a virus. Not from the supposed virus, as they want you to believe.

If they are showing as notifications at the top right of the screen, please see: Stop unwanted Notifications - Apple Community