The infected person ( animal ) carrying highly transmissible virus must traveled Wuhan without infecting anyone else.No one family got sick.If person jumped train Wuhan , fellow passengers fell ill. It ’ stretch , words , get pandemic break naturally outside Wuhan , without leaving trace , make first appearance there.For lab escape scenario , Wuhan origin virus no-brainer.Wuhan home China ’ leading center coronavirus research , noted , researchers genetically engineering bat coronaviruses attack human cells.They minimal safety conditions BSL2 lab.If virus unexpected infectiousness SARS2 generated , escape would surprise.2 ) Natural history evolution.The initial location pandemic small part larger problem , natural history.Viruses ’ make one time jumps one species another .