How do you place an anti-virus in your USB?

What I mean is, it's like having a separate anti-virus in you USB to prevent worms and everything. Is it possible?

How do you place an anti-virus in your USB?antispyware

use this

http://portableapps.com/apps/utilities/c...

How do you place an anti-virus in your USB?best antivirus software

just slide it in gently, use lubricant if u need to... for worms u need to drink prune juice...
don't know