USB stick: 

A new method to measure HIV-1 viral load in the blood stream!

Ok, ok, ...I extrapolate a lot.
However it could happen in a near future. A team of scientist in London developed a pH sensing semiconductor in order to measure HIV-1 viremia. A small sample of blood can be placed on phone chip and onto a USB spot. Any HIV-1 virus present will change the pH which translated into an electric signal. Innovative!

The technology could be used for other viruses like hepatitits.

If you want to read more:

HIV test performed on USB stick
Novel pH sensing semiconductor for point-of-care detection of HIV-1 viremia

Enjoy!