Signs are mounting that the U.S. economy is losing some steam as the Omicron variant of the Covid-19 virus spreads rapidly through parts of the country.

The number of diners seated at restaurants nationwide was down 15% in the week ended Dec. 22 from the same period in 2019, a steeper decline than in late November, data from reservations site OpenTable show. U.S. hotel occupancy was at 53.8% for the week ended Dec. 18, slightly below the previous week’s level, according to STR, a global hospitality data and analytics company.

Rising case numbers are leading many businesses to close for a short period, entertainment venues to cancel shows, universities to shift classes online and offices to delay or reverse reopening plans.

Regional Covid-19 case rates, 7-day averageSource: WSJ analysis of Johns Hopkins University​and Census Bureau data
SouthWestNortheastMidwestFeb. 2020’21020406080100cases per 100,000 residents

“We are still on track for very strong fourth-quarter consumption, but I am now seeing that that momentum continues to fade,” said Aneta Markowska, chief economist at Jefferies LLC.

Employers are clinging to workers in a tight labor market. Jobless claims, a proxy for layoffs, were unchanged at 205,000 in the week ended Dec. 18, the Labor Department said Thursday. Claims are hovering near the lowest level in more than half a century despite rising concerns about Omicron.

Consumers boosted their spending by 0.6% last month, a slowdown from 1.4% growth in October, the Commerce Department reported Thursday. Economists attributed part of the November slowdown to consumers shifting their holiday purchases a month earlier, amid warnings of potential shortages due to supply-chain problems.

For now, economists expect the highly contagious Omicron variant to cause a short-term soft patch for spending and broader economic growth as some people stay home.

Many economists have lowered their growth projections for early 2022 due to growing concerns about the latest surge in coronavirus cases. The forecasting-firm Oxford Economics now expects U.S. gross domestic product to grow at a 2.5% annual rate in the first quarter, down from a previous estimate of 3.4% growth.

Much of the difference in output could be delayed, rather than lost altogether. Economists at Nomura lowered GDP forecasts for the current quarter and the first quarter of 2022, in part reflecting forecasts for weaker consumer spending tied to Omicron. However, they expect growth to pick up in the second half of next year as pandemic-induced supply-chain disruptions ease and inventory investment that was pushed off materializes.