OWA and Antivirus software for Exchange

Does the dedicated OWA server need any special antivirus software for
Exchange in addition to the common antivirus server software? Why?

By using IIS service, the actual OWA server contains no mailbox store, nor
is any SMTP traffic transmitted across it. Thus there is no e-mail to scan
on the OWA server, assuming that this is the server's only function.