Can an unprotected Linux server be a vector for Windows viruses

I have a Linux server, several Windows 7 PCs, an X-Box, a TV, a Sony DVD player and an IPad on my home LAN.

All devices are behind my hardware router. The router has ports 21, 22, 80, 3389, and 10000 opened to the Linux server.

The Windows PCs each have the Windows software firewall enabled, and each have good virus protection.

The Linux server has the Centos software firewall enabled, however, does not have any virus protection.

The X-Box, TV, DVD player, and IPad are configured as they came out of the box. Could any of these be homes for a virus to hide?

I am concerned that the Linux server with its lack of virus software might be a vector for virus to my Windows PCs. Is this a concern? Please provide any suggested actions I should take (i.e. add a particular virus software, place it in a DMZ, etc).

Thank you

Hi -
Read this for more on linux security: http://www.linuxtopia.org/LinuxSecurity/index.html
Also read and post questions in the Linux / Unix areas on this forum >> http://www.bleepingcomputer.com/forums/forum11.html

Sample older quotes are below >>

Antivirus programs are not usually necessary unless you plan on moving files from Linux to Windows.
Have installed Clam tk, and both times were because I knew I had gotten some malware from a different computer.
Possibly someone will come along that can give you more detailed information.

Hi

I recommend using ClamAV for basic malware protection. Also recommend rootkit checkers like chkrootkit and rkhunter as well as Open Source Security(OSSEC) for host based intrusion detection.

Is your Linux server a file server to your Windows machines?