What is the best anti-virus app for iphone 5

You don't need an antivirus for the device, so don't worry about that

None, as nothing like that can infect a non-jailbroken iPhone.

If there was a real need for iPod touch, iPad, or iPhone virus protection right now, you can be sure the big security companies would be offering products for it.

Actually, they already do...the apps are in the app store, right now. However, none really work or are needed.

McAfee is not a anti-virus it just reports threats.

norton has a QR reader, or a find my phone+back up my contacts app.

the rest who knows. like i said if there is a need all the big names will do it.