New Analysis reveals link between birthdays and COVID-19 spread during the height of the pandemic.

News release: New Analysis reveals link between birthdays and COVID-19 spread during the height of the pandemic – Harvard Medical School

Original Study: Assessing the Association Between Social Gatherings and COVID-19 Risk Using Birthdays – JAMA Internal Medicine

Commentary on Twitter (thread – click for more)

The link between birthdays and Covid-19

Thread on our new study (w/ @CM_Whaley, Jon Cantor, Megan Pera) in @JAMAInternalMed

Using data on ~3M households, households in which a member had bday 2 wks prior were ~30% more likely to have a covid diagnosishttps://t.co/KHCvGAlvox

— Anupam Jena (@AnupamBJena) June 21, 2021