As COVID-19 case rates climb, California will enforce a statewide mask ban in all indoor public settings, the state’s top health official announced on Monday, as safeguards against the Omicron variety ratchet up.

The order, which goes into force on Wednesday and will last a month, is one of many steps taken by the most populous state in the United States to prevent a surge of illnesses that is already stressing hospitals in areas with poor vaccination rates.

“We realize people are tired and eager for normality,” state Health and Human Services Secretary Mark Ghaly told reporters during a conference call. “Frankly, I am as well.”

The rate of COVID-19 infections in California has jumped 47% since Thanksgiving to more than 14 cases per 100,000 people, Ghaly said.

The United States on Sunday reached 800,000 coronavirus-related deaths, a Reuters tally showed, as the nation braces for a potential surge in infections because of more time spent indoors with winter holidays and colder weather, and the highly transmissible Omicron variant.

In the UK, at least one person has died after contracting the Omicron variant, which now accounts for 44% of new infections in London, officials said.

California is also tightening testing requirements for unvaccinated people who want to attend large events such as music festivals and professional ball games where more than 1,000 people are in attendance.

When the tighter requirements are in effect, people wishing to enter such venues must either prove they are vaccinated or show they tested negative to a COVID-19 antigen test within one day of the event, or a PCR test within two days.

The state is also recommending that all travelers to the state be tested for COVID-19 within three to five days of arrival, Ghaly said.

The moves are meant to help California avert the need for more draconian measures such as limiting capacity in public places or shutting down parts of the economy. Such rules are not currently under consideration, and officials hope they will not be needed if residents comply with the mask rule, Ghaly said.