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On March 11, 2020, the coronavirus outbreak became a pandemic, turning a surreal crisis into a sudden reality for many Chicagoans.

In a matter of hours, Chicago would record its first case at a downtown office building, and the city’s St. Patrick’s Day celebrations were canceled. Later that night, as many prepared to work from home indefinitely, there was a barrage of breaking news: Tom Hanks announced that he was infected, the NBA suspended its season and then-President Donald Trump banned most travel from Europe.

Over the next 10 days, the sports and entertainment industries would come to a halt, Illinois would hold a primary election despite calls for a delay and a stay-at-home order

would go into effect across the state.

Here’s a look back at how the early days of the pandemic unfolded across our socially distanced public square — Twitter — and changed everything.

March 11

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March 21

More coverage:

During pandemic, Illinois saw 27% jump in deaths, among worst in the US. One reason: There were two waves.

What we’ve learned about COVID-19 at the one-year mark: The power of mRNA, the threat of virus mutations and the difficulty of vaccine rollout

Where were you when you realized the pandemic would change everyday life? Here’s what our readers said.

It started with the NBA on March 11, 2020. 24 hours later, COVID-19 shut down the entire sports world.

A year ago, COVID shut down Chicago’s arts. Where are we now?

Photos: One year of COVID-19 in Chicago