Quick Take:

“We are close to the finish line,” a city health official said. But some warn of a rebound of COVID-19 if residents relax their guard.

Known for their cautious approach throughout the COVID-19 pandemic, San Francisco leaders are cheering progress that allowed the city on Tuesday to move into California’s third of four tiers for reopening.

San Francisco, Marin and Santa Clara counties have joined San Mateo County in the state’s orange tier, representing moderate risk of the virus. The advancement means businesses can serve more people indoors, bowling alleys can reopen, breweries and bars can offer drinks outdoors and movie theaters can start selling popcorn again.

“San Francisco is going to come alive,” declared Mayor London Breed, who appeared at a news conference Tuesday in an orange dress to signify the city’s new status. She was joined by business leaders in hailing the new relaxed requirements.

Even San Francisco Public Health Director Dr. Grant Colfax, known for giving gloomy assessments during the pandemic, was upbeat.

“We are close to the finish line,” he said.

The easing of restrictions comes as some experts continue to warn of another possible wave of coronavirus cases in late April, fueled by a highly infectious variant first detected in the United Kingdom. Vaccine availability is also a wild card; two counties, Contra Costa and Solano, have expanded eligibility to people ages 50 and older, though Solano is facing a vaccine shortage.

San Francisco intends to allow most, but not all, of the reopening measures the state permits in the orange tier.

Dr. John Swartzberg, a UC Berkeley infectious disease expert, expressed dismay at the officials’ optimism.

“What is worrying me is that we are starting to open up quite quickly again with the storm still on the horizon,” he said in an interview after the news conference.

Swartzberg gave the odds of another “swell” of cases in California in late April at 60%. He noted that infections already have started to plateau in the state and are rising in other parts of the country. The U.K. variant may be the dominant strain of the virus in California as early as the end of the month, he said.

California “should be moving in baby steps and not big steps,” he said, adding that many people misconstrue what a finish line will look like.

“It will not mean we are COVID-free,” he said. “COVID is going to be background noise, just like influenza, and we are going to learn to live with it. We will be dealing with COVID for the indeterminate future.”

At the news conference, both Breed and Colfax tempered their cheer with advice that residents continue to wear masks, maintain distance, wash their hands often and get vaccinated when allowed.

“We need to double down on all our safety measures,” Colfax said.

Breed said nearly 40% of San Franciscans age 16 and older have been vaccinated, and nearly 80% of those 65 and older have received at least one dose.

Offices can now open at 25% capacity. Breed said she understood that some businesses would continue to allow employees to work remotely, but she hoped workers would “want to return to work and be around other folks.”

“Working at home is boring,” she said. “I want to be around people.”

Colfax noted that hospitalizations for COVID-19 are at their lowest point in more than four months, with just 35 patients on average daily in San Francisco. New infections are down to about 31 a day, compared with 374 during the winter surge, he said.

Colfax even suggested that the city might soon move into the least restrictive tier, yellow, allowing hotels, restaurants, fitness centers and other indoor establishments to more fully reopen.

“Let’s hope we are seeing the color yellow in just a few weeks,” Colfax said.

San Francisco officials said they intend to allow outdoor arts, theater and musical performances for audiences of up to 50 people staring April 1 and noted that they were developing guidelines for bringing back outdoor spectators and large outdoor entertainment venues. Those sites may also reopen in April, with approved health and safety plans, assigned seating and capacity restrictions.

Most indoor businesses will be allowed to operate at 50% capacity. Indoor dining will be expanded to 50% capacity or 200 patrons, and indoor gyms will be expanded to 25% capacity or 100 patrons. Group fitness classes may also resume at 25% capacity or 100 people, whichever is fewer.

Indoor museums, zoos and aquariums with an approved safety plan may expand to 50% customer capacity. Attendance at indoor houses of worship and funerals may rise to 50% capacity, with singing and chanting permitting by masked congregations. Indoor movie theaters may also expand to 50% capacity, up to 200 people.

Child care and pre-kindergarten programs may expand from 16 participants of stable groups to the number allowed by licensing requirements.

This story originally appeared in Los Angeles Times.