They say my mac is all virusy! What do I do to not transmit?

Howdy.
I feel like I just heard that I may have some highly contagious disease and I'm scared of passing it on.
Situation: I'm living in a South American country which is basically universally a pc environment and I quite happily do my writing/researching with my macbook. However, when I need to print stuff, I have to use a USB stick drive to transfer files to copy centers or internet cafes, since I don't have a printer at home.
Today, when I tried to (and eventually did) get some pdfs printed at a cafe, the person there had trouble with my USB drive and said "you've got a lot of viruses on this." Actually, she said "está lleno de virus." Obviously, this doesn't negatively affect how my computer runs, but I don't want to contaminate other computers, especially as I do back ups onto external drives and then transfer data to pcs.
What do I do to make sure that I'm not passing on viruses, via external harddrives or USB stick drives, to pcs?
Thanks!

Hi Christine,
These files that you're working with, were they received from someone else (who was using a PC) or did you create them on your Mac? It's very possible that the file is contaminated, which is why you're not experiencing problems but that doesn't mean you're not playing the part of an asymptomatic carrier.
Secondly, it's possible that the USB stick is the asymptomatic carrier and thus anything it plugs into transmits the virus to the host machine.
I'd recommend a few things:
1.) Wipe the USB drive, partition it in Disk Utility to ensure it's clean
2.) Run a thorough virus scan on the data and the drive via a Windows machine with an up-to-date anti-virus program
3.) Contact the people who sent you these documents and inform them that their machine might be infected (if you determine that any of the files you received from them were infected)

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