Some group of researchers from Colombia University have created a dongle compatible with any smartphone to check if you are HIV positive or even have syphilis. The dongle should cost about $34 and is undergoing final test. You just add a little bit of blood and press a button #dazzall. The dongle doesn't use a battery and is powered by plugging it into earphone jack.

Read full details here with video showing it at work: http://dammybas..com/2015/02/carry-out-hiv-test-with-your-phone-in.html