Friday’s number is the first below 60,000 since November 9, when daily cases, hospitalizations and deaths were on a several-month incline through the holidays.

Averages for daily new cases and deaths also have been declining for weeks after hitting all-time peaks around mid-January. Public health experts have been pressing for faster vaccinations, before more transmissible variants have a chance to spread, fearing they could reverse recent progress.

The CDC has said an apparently more-transmissible variant first identified in the UK could be the dominant strain in the US by next month.

“This is why we’re telling people to not stop masking, not stop avoiding indoor social gatherings quite yet, because we don’t really know what’s going to happen with this variant,” Dr. Megan Ranney, and emergency medicine physician with Rhode Island’s Brown University, told CNN Saturday.

“And we saw what happened last winter when we didn’t take Covid seriously enough.”

The national test positivity rate – or the percentage of tests taken that turn out to be positive – averaged about 4.8% over the last week as of early Saturday, according to the COVID tracking project.

That’s the first time the average has dropped below 5% since October, and it’s far below a winter peak of about 13.6% near the start of January.

The World Health Organization has recommended Governments not reopen until the test positivity rate is 5% or lower for at least two weeks.

‘We’re going to be shipping more doses than states have ever received’

After harsh winter weather cut vaccine shipments and caused vaccine appointment postponements in parts of the country in the last week, US officials say states should be prepared to start making up for it this coming week.

The US had a backlog of about 6 million doses that couldn’t be shipped because of bad weather this week.

“Saturday, we’re going to be shipping more doses than states have ever received before,” Andy Slavitt, a senior adviser to the White House Covid-19 response team, told CNN on Friday, “Because we’re going to be shipping this week’s doses and next week’s doses.”

“(Governors and states) are going to have to be ready. They are going to have to (facilitate) more appointments. They are going to have to extend their hours,” Slavitt said.

Los Angeles was among the areas affected by shipment shortages – appointments were postponed at city-run vaccination sites, including Dodger Stadium, on Friday and Saturday, CNN affiliate KABC reported.

But a site supported by the Federal Emergency Management Agency and the Defense Department was open Saturday at Cal State University’s Los Angeles campus.

One of the soldiers working at the site Saturday told CNN it was an honor to help the fight against the virus in the US after having served two tours of duty in Iraq as a medic.

“I was trained to be a lifesaver. … This is also what I joined the Army to do – not only just to help people overseas, but also to help people at home,” Sgt. 1st Class Gerardo Guzman said.

The pace of daily Covid-19 vaccinations slowed somewhat in this past snowy week. The country averaged about 1.59 million shots a day over the last week as of Friday, against 1.65 million a day the week prior, according to CDC data.

As of Friday morning, more than 41.97 million people in the US had received at least one dose of a Covid-19 vaccine, and 17.03 million have received two doses, according to CDC data.

Too risky to give single doses, Fauci says

One way to protect more people quickly, some experts suggest, is to prioritize administering first doses of the vaccine.

Dr. Ashish jha, dean of the Brown University School of Public Health, advocated Friday for US officials to consider delaying the second dose.

“Would that really be a problem, because if we could do that, we could vaccinate a lot more high-risk people, quickly … Everybody needs a second dose, but I think we can do it in a way that’s still safe and get a lot more people protected, “Jha told CNN’s Poppy Harlow.

But Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, said Friday that a single-dose plan would be too risky.

Fauci said he worried that if large numbers of people got a single shot and had less than optimal immune responses, they could be exposed to the virus and start incubating viral mutations. In theory, new variants could arise, he said.

“We will stick with the scientifically documented efficacy and optimal response of a prime followed by a boost with the mRNA vaccines,” Fauci told a White House briefing.

Jha, for his part, said he agreed that everybody needed a second dose, “I think the question is, right now we wait four weeks between first and second dose. What if we went six weeks or eight weeks or 10 weeks – not much longer than that. “

Vaccines may prevent infection and not just symptoms, study suggests

Health experts have said that data so far has shown that Covid-19 vaccines prevent symptoms of the virus – but a new study suggests that the Moderna and Pfizer / BioNTech vaccines may also prevent infections.
Hotel that hosted a mostly maskless rally for Florida & # 39; s governor is under investigation

A team at the Mayo Clinic health system looked at more than 31,000 people across four states who had received at least one dose of either vaccine – and found the vaccines were upward of 80% effective in preventing infection 36 days after the first dose.

Vaccine efficacy was 75% 15 days after the first dose, and it appeared to be 83% after a total of 36 days passed. But that number rose to nearly 89% when researchers examined only people who received two doses, according to the study, which has not yet been peer-reviewed.

While the trials that Moderna and Pfizer used to win Food and Drug Administration authorization for their vaccines looked for symptomatic infection, the Mayo researchers said they looked for both symptomatic and asymptomatic infection.

CNN’s Paul Vercammen, Christopher Rios, Amanda Sealy, Kevin Liptak, Maggie Fox, Nicholas Neville, Nicquel Terry Ellis and Holly Yan contributed to this report.

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