There is no true anti-virus, anti-spyware, or anti-malware on non-jailbroken iOS for several reasons:
1. iOS does not permit Apps to have the low-level OS access that would be necessary for such S/W.
2. iOS design isolates Apps from one another for security
3. iOS Apps are only available from the App store
4. There is no virus, spyware, etc. that affects the iPad
There are a couple of products that tout these capabilities but all they really do is check the content of e-mails received by the iPad to see if they contain known PC-virus, PC-malware, etc. The idea is that this will help prevent the spread of this malware to other computers.
For example of this see here:
http://www.intego.com/business/mac-virusbarrier-ios
