The holiday shopping season has arrived, and retailers are ringing it in by doing everything from cutting prices to stocking showrooms to lure back customers who stayed at home last year. What the biggest of them are not doing is the one thing the White House and many public health experts have asked them to: mandate that their workers be vaccinated.

As other industries with workers in public-facing roles, like airlines and hospitals, have moved toward requiring vaccines, retailers have dug in their heels, citing concerns about a labor shortage. And a portion of one of the country’s largest work forces will remain unvaccinated, just as shoppers are expected to flock to stores.

At the heart of the retailers’ resistance is a worry about having enough people to work. In a tight labor market, retailers have been offering perks like higher wages and better hours to prospective employees in hopes of having enough people to staff their stores and distribution centers. The National Retail Federation, the industry’s largest trade group, has estimated that retailers will hire up to 665,000 seasonal workers this year.

held up in litigation, challenged by a number of lawsuits from a broad coalition of opponents, and could make its way to the Supreme Court. Court filings by the administration warn that blocking the rule would “likely cost dozens or even hundreds of lives per day.”

have increased more than 20 percent over the past two weeks.

“It’s a pretty big ask, there’s no one denying that,” Crystal Watson, a senior scholar at the Center for Health Security at Johns Hopkins University, said of requiring vaccinations for retail employees. “But we’ve also tried a lot of other things to help people get vaccinated — and I think a mandate right now is what we need to get over that barrier.”

Walmart, the nation’s biggest private employer, declined to comment on the federation’s lawsuit or its plans for vaccinations or testing. A spokeswoman for Target said the company had “started taking the necessary steps to meet the requirements of the new Covid-19 rules for large companies as soon as the details were announced.”

Spokespeople for several retailers on the federation’s board, including Kohl’s, Dick’s Sporting Goods and Saks, declined to comment for this article.

have not required them for frontline workers, sharing concerns about challenges in hiring. But those workers, including about four million at stores, are among the most vulnerable. They interact frequently with the public and are less likely to be vaccinated themselves. Mandates at Tyson, United Airlines and several health care companies indicate that when faced with the prospect of losing their job, employees most frequently choose inoculation.

“We know vaccine requirements work,” said Kevin Munoz, a spokesman for the White House. “The federal government, the country’s largest employer, has successfully implemented its requirement in a way that has boosted vaccinations and avoids any disruptions to operations.”

Still, companies mandating vaccines have faced protests or lawsuits. In some states legislation has been passed to impede it. Disney, for instance, paused a mandate for employees at Disney World in Florida after it became illegal for employers in the state to require workers to get the shot.

The panic and precautions tied to Covid-19 have played out at retail stores throughout the pandemic and ensnared their workers.