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After a brutal summer surge driven by the highly contagious Delta variant, the coronavirus is retreating again.
USA is recording approximately 90,000 new infections per dayhas fallen more than 40 percent since August. Hospitalizations and deaths are also falling.
The crisis is not over everywhere – the situation in Alaska especially scary – but nationally, the trend is clear and hopes are rising that the worst is finally behind us.
Again.
In the last two years, the epidemic has swept over the country in waves, flooding hospitals and then retreating, but returned after the Americans let their guard down.
It’s hard to separate the causes of the virus’s ups and downs, and it’s even harder to predict the future.
But as winter approaches, there are real reasons to be optimistic. Almost 70 percent of adults many children under 12 who are fully vaccinated likely to be suitable for shoots in a few weeks. federal regulators may soon authorize The first antiviral pill for Covid-19.
Director of the Center for Emerging Infectious Diseases Policy and Research at Boston University, Dr. “Without a doubt, we are definitely in a better place this year than last year,” said Nahid Bhadelia.
But the pandemic isn’t over yet, scientists warned. About 2,000 Americans still die each day, and another winter wave is plausible. They said it was too early to abandon basic precautions, given how many Americans remain unvaccinated and how many are unknown.
Dr. “We did this over and over again where we took our foot off the pedal too soon,” Bhadelia said. “We have to be a little more careful trying to get to that finish line.”
When the first wave of cases hit the United States in early 2020, there was no Covid vaccine and essentially no one was immune to the virus. The only way to flatten the proverbial curve was to change individual behavior.
That’s what the first round of stay-at-home orders, workplace closures, mask orders, and banning large gatherings aimed to do. There is still debate about which of these measures is the most effective, but numerous studies show that collectively they make a difference. keeping people at home and prevent the number of cases from growing.
These policies together voluntary social distancingIt likely helped end the early surges, the researchers said.
“And then the measures will be lifted, maybe the memories will fade,” said epidemiologist Jennifer Nuzzo of Johns Hopkins University.
Eventually, cases would rise again and similar patterns would emerge. As businesses and local governments re-imposed restrictions, people would squat and mask as they began to reopen to the world.
According to the US, the percentage of Americans who reported going to bars or restaurants or attending major events, for example, decreased during the surge last winter. Covid-19 Trends and Impact ResearchSurveying an average of 44,000 Facebook users daily since April 2020.
Dr. “The curve is being shaped by public awareness,” Nuzzo said. “We oscillate between crisis and peace of mind.”
Delta came during a time of profound pandemic fatigue and a time when many vaccinated Americans felt they could finally relax. The data show that the new variant led to less profound behavioral changes than previous waves.
in mid-July, Only 23 percent of Americans He said they always wear masks in public, which is the lowest percentage since March 2020, according to the University of Washington Institute for Health Metrics and Evaluation, which collects data from several sources.
By August 31, the peak of the delta wave, that figure had increased to 41 percent, but well below the 77 percent of those who reported wearing masks during the winter wave.
Institute director Dr. “If you just look around, people are living a much more normal life, or a pre-Covid life,” said Christopher Murray.
Yet even modest changes in behavior can help slow transmission, especially in combination, and Delta has led to changes at both the individual and organizational levels. Schools have taken new measures, companies have delayed reopening, and organizations have canceled events, giving less opportunity for the virus to spread.
Meanwhile, milder autumn weather has arrived, making it possible for Americans in many parts of the country to socialize outside where the virus is less likely to spread.
“We are in a shoulder season where the weather in the south is cooler than mid-summer and warmer than mid-winter in the north,” he said. David O’Connor is a virologist at the University of Wisconsin-Madison.
Indeed, many current virus hotspots from Alaska to the northernmost parts of the country Minnesota, a place where even cooler temperatures can send people back in.
increased immunity
Behavior change is a temporary, short-term way to reduce cases. The real end of the epidemic will come with immunity.
The delta wave was the first major, national surge after vaccines became widely available and provided many adults with significant protection against the virus. (Delta also probably led More Americans will be vaccinated.)
At the same time, the variant was so contagious that it spread rapidly among vulnerable populations, conferring natural immunity to many unvaccinated Americans.
Although neither vaccination nor previous infection provides excellent protection against the virus, they significantly reduce the likelihood of catching it. So by September, the virus had a great difficulty finding welcoming hosts.
“We’re running out of people to infect in the Delta,” said Jeffrey Shaman, an infectious disease epidemiologist at Columbia University.
The decrease in the number of cases does not mean that the country has reached herd immunity. many scientists now believe unattainable. But increased levels of vaccination and infection, combined with more modest behavioral changes, may have been enough to end the rise.
“It’s a combination of immunity, but also people being vigilant,” said Joshua Salomon, an infectious disease specialist and modeler at Stanford University.
Indeed, scientists said, a combination of factors, which may differ in different parts of the country, will ultimately determine when and why the virus grows and declines.
“Different ripples and waves depend on how big the waves before it were, how many people were vaccinated, when schools reopen, different variants,” said Alessandro Vespignani., Director of the Network Sciences Institute at Northeastern University in Boston.
There is also some randomness involved, especially because few “super emitters” appears to play a disproportionate role in initiating epidemics. “About 10 to 20 percent of people are responsible for 80 to 90 percent of infections,” said biostatistician Christina Ramirez of the University of California, Los Angeles.
What You Need to Know About Covid-19 Booster Shots
FDA authorized booster shots For a selected group of people who have received their second dose of the Pfizer-BioNTech vaccine at least six months ago. This group includes: Pfizer recipients aged 65 and over or living in long-term care facilities; adults at high risk of serious Covid-19 due to an underlying medical condition; healthcare workers and others whose jobs put them at risk. with people weakened immune systems they are eligible to receive a third dose of Pfizer or Moderna four weeks after the second shot.
Regulators have not yet allowed booster vaccines for recipients of Moderna and Johnson & Johnson vaccines, but FDA panel scheduled to meet To weigh booster vaccines for adult recipients of Moderna and Johnson & Johnson vaccines.
The CDC said conditions that qualify a person for a booster shot include: hypertension and heart disease; diabetes or obesity; cancer or blood diseases; weakened immune system; chronic lung, kidney, or liver disease; dementia and some disabilities. Pregnant women and current and former smokers are also eligible.
The FDA has allowed boosters for workers whose jobs put them at risk of exposure to potentially infectious humans. The CDC says the group includes: emergency health workers; education workers; food and agricultural workers; manufacturing workers; correction workers; US Postal Service employees; public transport workers; grocery workers.
Not recommended. For now, Pfizer vaccine recipients are advised to receive the Pfizer booster vaccine, and Moderna and Johnson & Johnson recipients are advised to wait until these manufacturers’ booster doses are approved.
Yeah. The CDC says the Covid vaccine can be administered regardless of the timing of other vaccines, and many pharmacy sites allow people to schedule a flu shot at the same time as a booster dose.
This means that two similar communities could find themselves on radically different trajectories as a highly contagious person attends a crowded indoor event and fuels a major epidemic.
Some patterns still defy explanation. For example, in March and April, Michigan hit hard By the Alpha variant, the slightly less contagious predecessor of Delta.
Dr. Other states have largely recovered, for reasons that remain unclear, Murray said. “Why was Michigan the only state with a large Alpha surge in the spring?” said. “We have no idea.”
winter forecast
What happens next is difficult to predict, but cases may not necessarily continue their steady decline, the scientists warned.
The UK and Israel, both of which have higher vaccination rates than the US, are still battling epidemics.
“This should be a wake-up call,” said Michael Osterholm, director of the Center for Infectious Diseases Research and Policy at the University of Minnesota. “Don’t go back to the pre-July Fourth mentality where everyone thought it was all over.”
Most experts said they wouldn’t be surprised to see at least a small increase in cases this fall or this winter as people begin to spend more time indoors and travel for holidays.
But the upcoming winter spikes may be less catastrophic than last year, as vaccines continue to be highly effective in preventing hospitalizations and deaths.
Dr. “Unless we’re really unlucky with a new variant, it’s not likely to be as deadly as the surge we had last winter,” Salomon said.
The emergence of a new variant remains a wildcard, as is the possibility that the protection afforded by vaccination will begin to wane to a greater extent.
Our own behavior is another source of uncertainty.
“Predicting an outbreak is not like forecasting the weather because you’re dealing with human behavior,” said biostatistician Nicholas Reich of the University of Massachusetts, Amherst. “And that’s basically a really hard thing to predict: new policies that will go into effect, people’s reactions to them, new trends on social media, you know, the list goes on.”
But the scientists said our behavior is at least under our control and remains a critical variable as we enter winter. They generally did not recommend canceling vacation plans; many said they would celebrate themselves with friends and relatives. But they suggested taking reasonable precautions.
There’s still time to get vaccinated before Thanksgiving or to encourage your loved ones to get vaccinated. Wearing masks in certain high-risk environments, hosting outdoor events when the weather is nice, and getting rapid Covid tests before holiday gatherings are all common sense strategies to reduce risks, experts said.
“This doesn’t mean Christmas Lockdown 2,” said Angela Rasmussen, a virologist at the University of Saskatchewan’s Vaccine and Infectious Diseases Organization. “But that means we all need to be careful that this isn’t quite over yet.”
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