I believe there is only one anti-virus program for linux. It's called ClamAV.
However Linux is engineered in a fashion that makes it hard for viruses to run. Also, because more PCs currently run Windows, it is more worthwhile writing viruses for the Windows platform. However, there still may be some reasons you might want a virus scanner on your Linux PC:
- to scan a Windows drive in your PC
- to scan a Windows-based network attached server or hard drive
- to scan Windows machines over a network
- to scan files you are going to send to other people
- to scan e-mail you are going to forward to other people
- some Windows viruses can run with Wine
- Linux virus infections are theoretically possible
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