Linux on-demand virus protection?

[Scott R. Ehrlich]

Does anyone know of a good, reliable virus protection program for Linux that 
supports on-demand protection - that is, if a Windows or other 
virus/worm/malware activates, some mechanism of the virus protection 
application automatically (reactively) traps said application from causing 
[more] damage?

Thus far, McAfee's uvscan and ClamAV's clamscan do NOT support such 
functionality.   It would be nice to find a recommended AV program that does.

Thanks for any insights.

Scott