Flash Drive Protection

[Bushcat]

Hi Guys

Forgive me if this has already been answered.

I'm looking for something you can put on your flash drive that will stop any viruses an such getting on. I see many clients in a day and so my flash drive is a bit of a prostitute so I'm constantly formatting the thing. Unfortunately my flash drives don't have that locking feature.

I heard of an app that can do this but I have no idea what to search for.

Thanks a ton