Much of California is on the brink of sweeping new restrictions on businesses and activities, a desperate attempt to slow the frighteningly rapid escalation of coronavirus cases that threatens to overwhelm hospitals. Five San Francisco Bay Area counties imposed a new stay-at-home order for their residents that will take effect Sunday. Southern California and a large swath of the central portion of the state could join this weekend. Those two regions have seen their intensive care unit capacity fall below the 15% threshold that under a new state stay-at-home order will trigger new restrictions barring all on-site restaurant dining and close hair and nail salons, movie theaters and many other businesses, as well as museums and playgrounds. If their capacity remains below that level when the data is updated Saturday, the closures will take effect Sunday and stay in effect at least three weeks. Gov. Gavin Newsom announced the new plan Thursday. It is the most restrictive order since he imposed the country’s first statewide stay-at-home rule in March. The new order divides the state into five regions and uses ICU capacity as the trigger for closures. Newsom also says people may not congregate with anyone outside their household and must always wear masks when they go outside. As of Friday night, the 11-county Southern California region had only 13.1% of its ICU beds available, the California Department of Public Health reported. The figure was 14.1% for the San Joaquin Valley region, composed of a dozen counties in the agricultural Central Valley and rural areas of the Sierra Nevada. The other three regions – Greater Sacramento, Northern California and San Francisco Bay Area – were all around 21%. But health officers in five of the Bay Area’s 11 counties didn´t wait. On Friday, they adopted the state’s stay-at-home order. The changes begin to take effect Sunday night in San Francisco, Santa Clara, Marin, Alameda and Contra Costa counties, as well as the city of Berkeley. “We don´t think we can wait for the state´s new restrictions to go into effect. … This is an emergency,” Contra Costa Health Officer Chris Farnitano said. “Our biggest fear all along – that we won´t have a bed for you or your mother or your grandmother or grandfather when they get sick – is the reality we´ll be facing unless we slow the spread,” San Francisco Mayor London Breed said. The Bay Area order will last at least through Jan. 4, a week longer than the state’s timeline, and came as the state recorded another daily record number of new cases with 22,018. Hospitalizations topped 9,000 for first time and ICU patients were at a record 2,152. The new shutdowns were a gut-wrenching move for small businesses that have struggled to survive over nearly a year in which they were repeatedly ordered to close, then allowed to reopen but with complex safety precautions.