Read on Twitter
ITALY 
SCHOOL REOPENING: Nationwide in Italy, 15-20 days after schools reopened, #COVID19 surged. The “rate of growth of daily #SARSCoV2 cases in all Italian regions provides some evidence in favor of a link between school reopening and resurgence”.Detailed
by @DGBassani https://twitter.com/dgbassani/status/1380653399016890369
2) 70% of Italy region saw surges after reopening. The mean time delay was just 16 days! https://twitter.com/dgbassani/status/1380653408076623872
3) the other regions still had increases. Just longer or shorter time delays. https://twitter.com/dgbassani/status/1380653413768253456
4) the authors note that “while a 10% increase in in-person work also happened around the same time schools reopened, that affects the contact patterns of 2.5M people, while school reopening affects contact patterns of 11M people (school staff/students).”
Hence mainly schools.
Hence mainly schools.
5) Best evidence of school driven outbreaks in the world? Quebec 
... https://twitter.com/drericding/status/1364399105972273155
... https://twitter.com/drericding/status/1364399105972273155
