There is a sort of virus software for Linux called Clam. It doesn't remove any viruses, it doesn't need to, Linux is immune. All it does is point them out to you so that you don't accidentally email infected files to some poor dickhead still running Windows.
LOL. Yep....if you use portable media with common file formats for both Linux and Windows, having Clam might be useful in detecting malware that can harm Windows. I did have one experience where it detected a virus in Winetricks. That's about as good as it gets...

Otherwise in Linux alone it's utterly inconsequential. Then again it's just as easy to keep your portable media exclusive to each operating system.