Should I have to run a firewall or antivirus under virtual machines if the host iMac already has them running? Thanks!

I am learning my way around my new iMac (after using PC's ever since there first WERE PC's). In addtion to using the Mac OS, I am running two virtual machines (Windows XP Pro and Windows 7) during the transition and learning phase.
I am running with a firewall and antivirus on the iMac. Should I run an additional firewall and antivirus while in the virtual machines? Or is this completely unneeded? Thank you!

You really don't need the firewall or anti-virus software for OS X, and it won't protect a virtual machine. The VMs will need their own anti-virus software and protection for each VM.

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