Fatal Jump: Tracking the Origins of PandemicsExploring the fateful chains of events that gave rise to humanity's infectious diseases and pandemics. Why do global pandemics like COVID 19 materialize? To address this question, we must dive into the world of pathogens that transcend their original host species and jump into new ones. Upon attempts to jump into new species, most pathogens fail to initiate infection or spread in the population. Only a few sustain onward chains of transmission, and