Bacteria use chemical weapons. Using E. coli as a model, researchers sought to understand how simple regulators might produce multiple combat strategies. The investigation also tried to determine whether strategy would provide a survival advantage.
E. Coli
The Centers for Disease Control and Prevention (CDC) just announced they are temporarily suspending work by lab scientists in BSL-4 (aka biosafety level 4) facilities. They recently learned their current stock of air hoses that attach to the protective suits worn by staff have not been certified for breathing air.