Driven by a mobile phone chip, the gadget only needs a small amount of blood to perform its analysis. When the HIV virus is detected in the blood sample, the USB stick triggers a change in acidity which the aforementioned chip transforms into an electric signal. That signal is then translated into a reading for a program on either a computer or other electronic device. During the latest round of trials, the setup tested nearly 1,000 samples with 95 percent accuracy. In the meantime, scientists are hard at work on a cure for HIV, but a solution there could still be a long way off.