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U.S. regulators said Friday they are no longer considering authorizing a second COVID-19 booster shot for all adults under 50 this summer, focusing instead on revamped vaccines for the fall that will target the newest viral subvariants.

Pfizer and Moderna expect to have updated versions of their shots available as early as September, the Food and Drug Administration said in a statement. That would set the stage for a fall booster campaign to strengthen protection against the latest versions of omicron.

The announcement means the U.S. won’t pursue a summer round of boosters using the current vaccines for adults under 50, as some Biden administration officials and outside experts previously suggested. They had argued that another round of shots now could help head off rising cases and hospitalizations caused by the highly transmissible omicron strains.

Currently, all Americans ages 5 and over are eligible for a booster shot five months after their initial primary series. Fourth doses of the Pfizer or Moderna shots — a second booster — are recommended for Americans 50 and older and for younger people with serious health issues that make them more vulnerable to COVID-19.

The FDA urged eligible adults who haven’t been boosted to get their extra shot now: “You can still benefit from existing booster options and leave time to receive an updated booster in the fall,” the agency said in a statement.

The White House has also emphasized that getting a fourth dose now won’t impact anyone’s ability to get omicron-targeted shots once they’re made available — although how long it’s been since their last dose will play a role in how soon they’re eligible.

Two omicron subvariants, BA.4 and BA.5, are even more contagious than their predecessors and have pushed new daily cases above 125,000 and hospitalizations to 6,300. Those are the highest levels since February, though deaths have remained low at about 360 per day, thanks to widespread immunity and improved treatments against the virus.

The subvariants are offshoots of the strain responsible for nearly all of the virus spread in the U.S. this year.

All the COVID-19 vaccines given in the U.S. until now have been based on the original version of the virus that began spreading across the country in early 2020.

In June, the FDA told the vaccine makers that any boosters for the fall would have to combine protection against omicron BA.4 and BA.5 and the original coronavirus strain. Both manufacturers have been speeding their production and data gathering to have those so-called bivalent vaccines ready for the fall.

The FDA and the Centers for Disease Control and Prevention would have to sign off on revamped shots before their launch.

The U.S. has a contract to buy 105 million doses of the Pfizer combination shots once they’re ready, and 66 million of Moderna’s version. But how soon large amounts would become available isn’t clear. The government contracts include options to purchase 300 million doses each but reaching that total will require more funding from Congress, the Biden administration said.

As for timing, getting a booster too soon after the previous dose means missing out on its full benefit — something policymakers will have to take into consideration when rolling out revamped shots.

The White House has at times been frustrated by the pace of decision-making at the FDA and CDC, most notably last summer, when the regulators took weeks to decide whether to authorize the first booster dose for U.S. adults. Privately, West Wing officials believe the delay cost lives, preventing optimum protection amid the delta and omicron surges, and also fed into doubts about vaccine and booster effectiveness that affected their uptake.

In recent weeks, some of those frustrations have bubbled up again, as regulators considered whether to recommend a fourth shot for all adults, not just those at highest risk from the virus. Some in the White House believe that the additional dose would have helped somewhat with the rapidly spreading BA.5 subvariant, and also lift the confidence of anyone worried that their protection had waned.

Still, officials across the government have acknowledged the risks of vaccine fatigue among Americans, including tens of millions who still haven’t received their first booster. Government figures show less than half of those eligible for a booster have gotten that third shot.
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Scientists say wildfires in the American West are bigger, hotter and more destructive than in the past.
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Human-caused climate change made last week’s deadly heat wave in England and Wales at least 10 times more likely and added a few degrees to how brutally hot it got, a study said.

A team of international scientists found that the heat wave that set a new national record high at 40.3 degrees Celsius was made stronger and more likely by the buildup of heat-trapping gases from the burning of coal, oil and natural gas. They said Thursday that temperatures were 2 to 4 degrees Celsius warmer in the heat wave than they would have been without climate change, depending on which method scientists used.

The study has not been published in a peer-reviewed scientific journal yet but follows scientifically accepted techniques, and past such studies have been published months later.

“We would not have seen temperatures above 40 degrees in the U.K. without climate change,” study senior author Friederike Otto, a climate scientist at Imperial College of London, said in an interview. “The fingerprint is super strong.”

World Weather Attribution, a collection of scientists across the globe who do real-time studies of extreme weather to see whether climate change played a role in an extreme weather event and if so how much of one, looked at two-day average temperatures for July 18 and 19 in much of England and Wales and the highest temperature reached in that time.

The daily highest temperatures were the most unusual, a one-in-1,000-year event in the current warmer world, but “almost impossible in a world without climate change,” the study said. Last week’s heat smashed the old national record by 1.6 degrees Celsius. The average over two hot days and nights is a once a century event now but is “nearly impossible” without climate change.

When the scientists used the long history of temperatures in England to determine the impact of global warming, they saw a stronger climate change influence than when they used simulations from climate models. For some reason that scientists aren’t quite certain about, climate models have long underestimated extreme weather signals in the summer in Western Europe, Otto said.

With climate models, the scientists simulate a world without the 1.2 degrees Celsius of warming since pre-industrial times and see how likely this heat would have been in that cooler world without fossil fuel-charged warming. With observations they look at history and calculate the chances of such a heat wave that way.

“The methodology seems sound, but candidly, I didn’t need a study to tell me this was climate change,” said University of Georgia meteorology professor Marshall Shepherd, who wasn’t on this study team but was on a U.S. National Academy of Sciences panel that said these types of studies are scientifically valid. “This new era of heat is particularly dangerous because most homes are not equipped for it there.”

The World Weather Attribution study refers to another analysis that estimates a heat wave like this would kill at least 800 people in England and Wales, where there is less air conditioning than in warmer climates.

Otto, who had to sleep and work in the basement because of the heat, said as the world warms, these record-smashing heat waves will continue to come more frequently and be hotter.

In addition to spurring people to cut greenhouse gas emissions, study co-author Gabe Vecchi said, “this heat wave and heat waves like it should be a reminder that we have to adapt to a warmer world. We are not living in our parents’ world anymore.”
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Los Angeles County dropped a plan to impose a universal indoor mask mandate this week as COVID-19 infections and rates of hospitalizations have stabilized, a top health official said Thursday. 

Health director Barbara Ferrer said two weeks ago that the nation’s most populous county could again require face coverings if trends in hospital admissions continued under criteria set by the U.S. Centers for Disease Control and Prevention. 

On Thursday, she said the county had dodged imposition of the broad mask rule. The county remains at the “high” CDC level of community transmission, but it could drop to “medium” in coming weeks. 

Ferrer made the announcement during a briefing at which she displayed flat and declining data graphs. She said transmission had dropped steadily since July 23, “potentially signaling the beginning of a downward trend in cases.” Hospitalizations are also down. 

“We’re on a decline right now, and it’s hard for us to imagine reinstating universal indoor masking when we’re on this significant of a decline,” Ferrer said. But she added that health officials would reassess things should case rates and hospital admissions spike again. 

While masks won’t be required in most indoor spaces, Ferrer reminded residents that face coverings remain an effective tool to reduce the spread of the coronavirus. 

As it has for most of the pandemic, L.A. County will still require masks in some indoor spaces, including health care facilities, mass transit vehicles, airports, jails and homeless shelters. 

The new mandate, which would have gone into effect Friday, would have expanded the requirement to all indoor public spaces, including shared offices, manufacturing facilities, warehouses, retail stores, restaurants and bars, theaters and schools. 

Nationwide, the latest COVID-19 surge is driven by the highly transmissible BA.5 variant, which now accounts for a majority of cases. It has shown a remarkable ability to get around the protection offered by vaccination.
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