NEW YORK • New York City declared on Monday that all private-sector employers must implement COVID-19 vaccine mandates for their workers, as the highly transmissible Omicron variant has spread to at least one-third of U.S. states.

The biggest U.S. city set a Dec. 27 deadline for all 184,000 businesses within its limits to make their employees show proof that they have been vaccinated.

In addition, children 5 to 11 years old must get at least one vaccine dose by Dec. 14 to enter restaurants and to participate in extracurricular school activities, such as sports, band, orchestra and dance, Mayor Bill de Blasio said.

“Vaccination is the way out of this pandemic, and these are bold, first-inthe-nation measures to encourage New Yorkers to keep themselves and their communities safe,” de Blasio, who leaves office next month, said in a statement.

De Blasio’s successor, Eric Adams, “will evaluate this mandate and other COVID strategies when he is in office and make determinations based on science, efficacy and the advice of health professionals,” said his spokesperson Evan Thies.

About 27% of children ages 5 to 12 have gotten at least one dose and 15% are fully vaccinated, according to the city’s website.

The Greater New York Chamber of Commerce said it supported the expanded mandate.

Over the last week, the country has averaged more than 120,000 new infections a day, up 64% from the prior week, according to a Reuters tally.