https://www.sciencedaily.com/releases/2018/05/180524141712.htm

This "bacteria-on-a-chip" approach combines sensors made from living cells with ultra-low-power electronics that convert the bacterial response into a wireless signal that can be read by a smartphone.

"By combining engineered biological sensors together with low-power wireless electronics, we can detect biological signals in the body and in near real-time, enabling new diagnostic capabilities for human health applications," says Timothy Lu, an MIT associate professor of electrical engineering and computer science and of biological engineering.