Open Question: Does my USB stick still have a virus?

My USB memory stick has not been working today and it is slowing down my laptop while it is inserted into the drive. When I inserted in to another computer, a message popped up saying that it was infected with malware. I put the malware into the virus chest, and proceeded to do a complete system scan on my laptop. The scan detected two viruses, which I put into the virus chest. However my laptop is still slow when the USB is inserted and the USB program will not work. So my question is, is my USB still infected even though the viruses found in :F were put into the virus chest? Thanks so much!