Coronavirus store closings, reduced hours: Nordstrom extends closures, Costco cutting hours starting March 30

Updated: Nordstrom announced it has extended store closures "for at least one week, through April 5." Best Buy and GameStop have reversed decisions to stay open since this story was originally published and additional stores have cut hours. See the list below for the latest updates.

As normal everyday life grinds to a halt amid the coronavirus pandemic, some of the nation's biggest retailers have temporarily closed thousands of stores to help stem the spread of the virus.

Simon Property Group, the largest owner of shopping malls in the nation, closed all of its properties on Wednesday. Westfield and Taubman malls followed with U.S. closures on Thursday.

Not everyone is deserting their posts. Grocery stores, gas stations and pharmacies are keeping their doors open to help people stay stocked with essentials, though many are shortening store hours to clean and restock. Walmart, the world's largest brick-and-mortar retailer, shortened hours beginning Thursday, for the second time in less than a week.

Those stores are joined by office supply and home improvement chains which say they, too, provide essentials. Among the justifications: they provide products people – including first responders – need in a natural disaster. Others say they sell supplies that people need to work and school their children from home.

Coronavirus closings: Macy's, Apple, Sephora say they'll reopen soon. But will they?

Senior-only shopping?: Stores designate shopping time for seniors vulnerable amid coronavirus: Safeway, Whole Foods, Target and more

And then there are retailers like GameStop and Barnes & Noble, who, as of Thursday afternoon, were staying open with reduced hours and announced steps to implement social distancing. But public experts say these stores don't fulfill a critical need in the same way as pharmacies and home improvement stores.

“We have a very short window to prevent this crisis from turning into a catastrophe," said Leana Wen, an emergency physician and public health expert at George Washington University. "So, it is the responsibility of every person to do their part to not do anything that's not essential." She said all non-essential stores should close to help stop the spread of the virus.

Dr. John Swartzberg, a professor of infectious diseases at the University of California, Berkeley, School of Public Health, said stores providing essentials must remain open, but others should close.

“The more people interact with other people, the more the opportunity to spread,” he said. “Stores are a perfect place for viruses to transmit, especially when they are crowded."