Engrossing true stories of the pioneers of epidemiology who risked their lives to find the source of deadly diseases--now revised to include updated information and a new chapter on Covid-19. More people have died in disease epidemics than in wars or other disasters, but the process of identifying these diseases and determining how they spread is often a terrifying gamble. Epidemiologists have been ignored, mocked, or silenced all while trying to protect the population and identify "patient zero"--the first person to have contracted the disease, and a key piece in solving the epidemic puzzle. Patient Zero tracks the gripping tales of eight epidemics and pandemics--how they started, how they spread, and the fight to stop them. This revised edition combines a brand-new design with updated information and features diseases such as Spanish Influenza, Ebola, and AIDS, as well as a new chapter on Covid-19.