Daily virus scan for humans

You know what would be really cool? A daily virus scan for human beings like we have for computers. Once a day, a scheduled scan would check our bodies for diseases. If we had a problem, an alert would signal and a prescription would print out of our bodies, from a convenient slot (no points for guessing where from) and we could take it down the chemist to get the necessary disease-combating drug... problem solved!

I would like to say that I thought of this whilst on public transport but the truth is, I was brushing my teeth. And no, I was not stoned at the time...