How could you make a USB memory stick safe to use after it has been infected by a virus?

To make a USB memory stick safe to use after it has been infected by a virus, first, back up any important data to a secure location. Then, format the USB drive using your computer's disk management tools to erase all data, including the virus. After formatting, run a reputable antivirus program to scan the USB stick before transferring any files back onto it. Finally, ensure that your computer is also free of malware by conducting a thorough system scan.