Is there any virus attack on any of the current distributions of Linux?
if there is any, how was it solved? have they used any anti virus programs which are available now?
There is a worm going around for an exim4 vulnerability in Debian: http://blog.bytemark.co.uk//2010/12/12/fresh-worm-food
There has never been a single major virus epidemic affecting Linux hosts "in the wild". The vast majority of virus attacks on Linux are just theoretical, and the few that have actually been implemented have never been able to spread beyond a handful of hosts.