The CDC has traced Chicago's coronavirus outbreak to just *two* family gatherings. The new case study, one of the most detailed looks at how covid-19 moves through communities, shows how just one person can set off a chain reaction of infections.

The CDC has traced Chicago's coronavirus outbreak to just *two* family gatherings.

The new case study, one of the most detailed looks at how covid-19 moves through communities, shows how just one person can set off a chain reaction of infections.
https://t.co/u53AFNDvnv

— James Hohmann (@jameshohmann) April 9, 2020