WE ASKED CATCH'S SCIENTIFIC ADVISORS:
CATCH is set in a world where not only have antibiotics become ineffective, but the world is also gripped by a lethal bacterial epidemic.
An epidemic is the widespread occurrence of an infectious disease in a short space of time. There have been many epidemics throughout history, from the Medieval bubonic plague, the 1919 flu virus to modern ebola.
Epidemics that spread into several countries or even right around the world are called pandemics.
Follow the links below to find out more on epidemics: