Nope, I don't believe it's necessary, but really unsure. I guess I depends on how much time you spend on the Internet. Take a look at http://www.androidcentral.com/antivirus-android-do-you-need-it

Good luck,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)