"Hi tech support? I think I have an infected USB port, can you help me"?
What is the most common I/O port used on a computer?
Yep USB .. Take a look at this Interesting read. Oh by the way, my stethoscope isn't infected :)

http://gizmodo.com/usb-has-a-fundamental-security-flaw-that-you-cant-detec-1613833339