There are some USB storage devices that have a default auto-run software solution detected as a threat by some antivirus programs. To be sure that this isn't your case, check the manufacturer's website to see if there is something mentioned about this.
If it isn't your case, be sure you have your antivirus software solution up-to-date at all times. After you performed an update, try to start a scanning process for the entire computer (USB drive included). If the virus is still found on another computer, try doing the same thing on that one. Also, download and use Malwarebytes Anti-Malware. It is also a good idea to perform a full format of the USB drive, after you backed up your data from it.