Is there a way to protect a USB flash drive from virus?

My daughter's school computer lab is seemingly infected with some PC virus but their school IT folks seem to be unable to clean them and with all the young kids using USB flash drives they brought these viruses home when they plug the flash drive into our home computer but luckily since we are using Mac at home and I have ClamXav installed it detected the virus immediately. So we are kind of safe but I am getting tired of removing this same virus every week using UNIX command in a terminal mode, as it's locked and can only removed using the sudo command (taught by some people). My questions are:
1. Is there any way to protect a USB flash drive from virus infection (it's a window PC virus)
2. is there a way or suggestion on how to stop these apart from dis-infecting the whole school computers? The problems are that these young kids are not aware of those viruses in their USB flash drives and their teachers are just too ignorant about it!
Thanks for any suggestions and help

I'd still invest in your case into Mac protection against passing along malware.
Take a look at Intego AV for one for the Mac and for dual-protection.
http://www.intego.com
Whatever you are finding is 'dormant' I assume, but that doesn't mean it can't become active or passed along either. And there are some 'man in the middle' spyware and malware, some which target online home banking (some people run their home banking from a virtual OS that is used for that purpose only, I always wished Mac OS X could be run in a VM mode as well).
The IT folks sound like they need... do their jobs properly and better.
I don't care how young they are, or the staff's ignorance. Time for education is now.
Download and install Microsoft Security Essentials in Windows and follow guidelines. And there are tons of FAQs, guidelines and articles on the subject.
http://www.microsoft.com/Security_Essentials/
http://www.microsoft.com/security/portal/
Nearly six months after Apple added a malware blocker to Mac OS X (Snow Leopard), the feature appears to be collecting cobwebs.
Apple has not added any anti-malware signature updates to the XProtect.plist file that launched with antidotes for OSX.RSPlug.A and OSX.Iservice, two known Trojan horse programs targeting Mac OS X users.
http://blogs.zdnet.com/security/index.php?cat=20&submit=view

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