There are a number of anti-virus applications available for Linux, most of which are designed for servers, including:

• Avast! (freeware and commercial versions)
• AVG (freeware and commercial versions)
• Avira (freeware and commercial)
• Bitdefender (freeware and commercial versions)
• ClamAV (free open source software)
• Dr.Web (commercial versions) ^[9]
• Eset (commercial versions)^[10][11][12]
• F-Secure Linux (commercial)
• Kaspersky Linux Security (commercial)^[13]
• Linux Malware Detect (free open source software)
• McAfee VirusScan Enterprise for Linux (commercial)^[14]
• Panda Security for Linux (commercial version)^[15]
• Root Kit Hunter ^[16]
• Sophos (commercial)
• Symantec AntiVirus for Linux (commercial)^[17]
• Trend Micro ServerProtect for Linux (commercial)

From:http://en.wikipedia.org/wiki/List_of_Linux_computer_viruses

References:
http://www.avast.com/zh-cn/index
http://www.avg.com/cn-zh/china-homepage
http://www.avira.com/
http://www.bitdefender.com/
http://www.clamav.net/lang/en/
http://www.drweb.com/(none english)
http://www.eset.eu/home
http://linux.chinaitlab.com/safe/775732.html
http://linuxtoy.org/archives/3_free_antivirus_under_linux.html