[fetchmail]Fetchmail + antivirus

Hi all,

I would knowing how to scan virus by fetchmail.
I have qmail like MTA but i have external email.
It exists a solution in fetchmail to add a mda option but qmail-inject
don't scan virus.
So when fetchmail get emails, these emails aren't be scan by
qmail-scanner.
Any idea ??
Thanks great a lot.
Best regards