“patient zero”

In a time of coronavirus, small mistakes can have outsize consequences.

In the small southern Italian town of San Marco in Lamis, a man who died before it was known that he was carrying the virus infected his wife and daughter, who then came into contact with dozens of relatives and friends at his funeral – 70 of whom are now in quarantine.

https://www.theguardian.com/world/2020/mar/07/coronavirus-a-disease-that-thrives-on-human-error