More Bay Area counties forced to scale back reopening plans.

Outdoor dining will not be allowed after all in Alameda County.

Restaurants, bars and wineries in the county will be allowed to open for drivethrough, takeout or delivery service only, according to Neetu Balram, spokeswoman for the Alameda County Public Health Department.

Alameda County had already allowed restaurants to provide outdoor dining but now must reverse course because of a state rule issued Thursday.

The county is applying in the coming week for a variance, or permission, to move faster on reopening its economy so it can again reopen outdoor dining and also get the Oakland Zoo, which has been closed since March, opened again.

The turnaround in the dining policy is the latest development as county and state health officials try to cope with the recent spikes in coronavirus infections throughout California. On Friday, the number of Califor

nians hospitalized with COVID19 reached another record — 6,357, up substantially from 6,171 patients a day earlier. The rate of positive coronavirus test results, a key indicator, has trended upward in California over the past 14 days, health officials reported Saturday.

Concern is rising throughout the Bay Area. Sonoma County was added to the state watch list Friday, and if numbers do not improve the county’s restaurants, wineries and bars must end indoor service, possibly as soon as Monday. Movie theaters and indoor museums would also need to close.

In Santa Clara County, health officer Dr. Sara Cody used a video message Saturday to plead with residents to observe safety precautions, saying, “The numbers in our county are not going in the right direction.”

Among California’s 58 counties, only Alameda County, and Imperial County in Southern California, are barred from allowing outdoor dining. Oakland, Hayward and Livermore said they would not immediately enforce Alameda’s ban.

On Saturday, the proprietor of Aunt Mary’s Cafe on Telegraph Avenue in Oakland said she had planned to serve a $16 Cajun French toast special at her five outdoor tables, but now would hold off under the new policy. Returning to takeout only will mean about $5,000 a week in lost revenue.

“We have to do what we have to do,” coowner Nu Ho said. “We haven’t gotten the news yet. It’s pretty stressful. I expect going back to takeout will cut our income by half.”

At Jack London Square, Ayla Bergeaux, the general manager of the Forge Pizza restaurant, said she had to tell three dozen employees not to come to work after she got word that the rules had changed yet again.

“It’s definitely frustrating, that’s for sure,” Bergeaux said.

Contra Costa County officials also said Saturday they would tighten their rules for restaurants after a rise in the rate of positive coronavirus tests. Outdoor dining is permitted, but the new rules will require diners and waitstaff to wear a face mask “at all times, except when putting food or drink in the mouth,” officials said.

Members of the same social bubble are now required to cover their face when together except when eating or drinking.

Contra Costa County will also temporarily ban indoor worship services, officials said Saturday, though the ban does not start until Monday — so this Sunday’s church services can take place.

More than 8% of people tested for the coronavirus in the past week were positive, county health officials said, meaning the virus is “spreading rapidly in the county.”

In June, officials decided that an 8% positive test rate would spur review and reconsideration of the reopening plan. Health experts are concerned the coronavirus swell could overwhelm the hospital system if the number of patients needing intensive care exceeds the county’s 209bed capacity. “The community must take immediate steps to prevent our health care system from becoming overwhelmed,” county health officials stated.

Steve Rubenstein and Anna Bauman are San Francisco Chronicle staff writers. Email: srubenstein@sfchronicle.com, anna.bauman@sfchronicle.com Twitter: @SteveRubeSF, @abauman2