Can you refrain yourself from installing shady and unknown apps ?
Can you review the permissions an app is asking for before allowing them?
Can you verify the app’s publisher before installing it ?
Can you take your time and read the reviews for the app you want to install?
If the answer is 'Yes' then you most likely you don't need an antivirus....but If you are one of those guys who like to do it and then read about it ...then here are a few suggestions :
At this point in time cybercriminals are using trojanized applications in order to infect the Android OS. They typically find a popular app, modify it to include their malicious payload, and then re-upload it to the Android market where it poses innocuously as the original. Once a confused user downloads the infected app, his or her Android device is ready to share all sorts of juicy details with the cybercriminals.
Recently
Mobile Threat reported that android malware affects from 500,000 to 1 million smartphone users..so if you don't have common sense ,
please install a security app.