In the past two weeks, the delta type of coronavirus has appeared dashed hopes Many Americans are looking forward to celebrating “hot summer” and the end of the pandemic.
as health experts warned in juneThe highly contagious delta variant hit especially in states with low vaccination rates, Filling hospitals and morgues Back in the day to some of the darkest days of the pandemic. And unlike previous variables, the new data suggests that some vaccinated people who have had delta virus — while largely protected from severe disease — can still spread the virus to others. This has led to the Centers for Disease Control and Prevention (CDC) advising on vaccinating people in areas where the virus is most prevalent. You should resume wearing masks In indoor public places.
Big questions still remain About the prevalence of “hack” cases in Delta. But there is now a growing sense of dread that Delta will be an unstoppable force.
However, the message from experts who monitor delta waves in Europe is more encouraging, suggesting that the usual rulebook still applies: vaccination and strategies such as covering up in public and avoiding crowds can keep case numbers low.
Meanwhile, some observers I looked at what happened With Delta in the United Kingdom and India, where the variant was first discovered, it has been speculated that Delta misery in the United States may occur in least short-livedEverything we do is to limit its spread. In both countries, the sharp rise in cases was followed by a similar rapid decline, indicating that the rapidly spreading delta variant usually burns itself out fairly quickly.
There are two big problems with this view. First, if we let Delta simply run its course, the cost in overburdened lives and hospitals would be high.
“On the way to this point, there will be a catastrophic number of hospitalizations,” Lauren Ansel Meyers, a computational epidemiologist at the University of Texas at Austin and director of UT Modeling Consortium COVID-19, for BuzzFeed News. “It will overburden your healthcare system.”
Second, if you look at the variety of delta curves seen across Europe, it is not clear that there is a fast-burning delta wave. And in those countries that have experienced rapid ups and downs, it appears that changes in people’s behavior – rather than the inherent characteristics of the delta variable – are a large part of what turned things around.
Dive into the reasons behind the various delta waves seen across Europe, and a more optimistic message emerges: As frightening as it may be, the delta variant appears to be manageable. Vaccination is our best weapon, but modest social distancing measures that have worked against other, less transmissible forms of the coronavirus can help tremendously.
Delta waves in selected countries
It makes no sense to compare catastrophic delta wave in india With those in the US, UK and other European countries, experts say. It is not only India’s huge population highly invulnerable At the time, the Delta variant devastated the country in April and May, but monitoring and testing were so incomplete that it was unclear whether the curve recorded for new cases accurately reflected the number of people infected.
But if you look at the delta waves seen so far in European countries and the United States, the curves are very different. In the chart above, only the UK and the Netherlands showed a fast rise and fall, while other countries experienced a slower rise. In Germany, the delta curve is hardly a flicker.
While the UK was exposed to delta variant before others, largely due to people traveling to and from India, the timing at which delta established its dominance cannot explain the differences between the other countries shown.
It is very difficult to disentangle the exact reasons for the differences between the delta waves of European countries. But transmission will depend on how many people have some immunity — either through vaccination or previous coronavirus infections — and the behavior patterns that encourage the spread.
Among the countries shown, France has the lowest vaccination rate, with 49% of its entire population being vaccinated (the United States is slightly ahead of this, at 50%). Meanwhile, the UK has the highest rate, with 57.3% of the population fully vaccinated. The other European countries shown are all tightly packed between 53.2% and 54.2%. Therefore, the extent of grafting does not seem to explain the large differences observed in the delta curves of the countries.
One evidence that differences in people’s behavior played an important role is Germany’s retention Stricter social distancing controls More than most of its European neighbours, requiring people who do not live together to separate 1.5 meters (about 5 feet) and to wear medical masks on public transport and in stores.
Meanwhile, looking at the two countries that experienced a rapid rise and fall in delta-induced states provides strong hints that large gatherings of people played a large role in each of those waves.
How the Football Championship boosted the UK’s Delta wave
The boom in the UK appears to have accelerated due to Euro 2020 Football tournament where fans crowded into bars and homes to watch matches. In both England and Scotland, the rise in new cases increased significantly a week or two after the two teams played their first matches, only to reverse two weeks after each team withdrew.
Team Scotland were fired early. But in England, which reached the final, the observation parties lasted until July 11.
The timing of subsequent peaks is exactly what epidemiologists would expect if gatherings to watch the games were the most powerful drivers of delta waves. “It takes two weeks for the signal to appear unambiguously in the data,” Paul Hunter, an epidemiologist at the University of East Anglia in the United Kingdom, told BuzzFeed News.
In contrast to previous increases in the UK, cases were dominated by men, in proportion to the demographics of those who watched matches. and New study From Public Health Scotland the notion that Delta’s declared peak in the UK was largely driven by a breakdown in social distancing during tournament viewing parties. At its peak, the researchers noted, “more than half of the cases reported in Scotland attended an EURO 2020 event or were in close contact with an individual who attended”.
Most of those infected were fairly young and did not develop severe disease. This, combined with the UK’s rapid progress in vaccination in the past few months, means that the peak hospitalization was less than a fifth of that seen in the UK in January, at the height of its wave with the alpha variant. And while COVID deaths have risen slightly, currently only about 90 people per day die from the disease across the UK, compared to more than 1,200 at the height of the alpha wave.
The rapid turnaround in UK cases baffled some experts who had predicted infections would rise to new heights after ‘Freedom Day’ on July 19, when Prime Minister Boris Johnson removed remaining coronavirus restrictions in England, allowing pubs and restaurants to operate normally and removing all requirements the mask.
While Neil Ferguson, a pathology designer from Imperial College London, has predicted new cases will emerge It can go up to 200,000 per day, the seven-day rolling average of new cases peaked at just under 50,000 cases per day before Freedom Day before starting to decline. In the past few days, the decline in the number of cases appears to have leveled off, and It is not clear Where the delta wave in the UK travels from here.
The other European country that has seen an obvious rapid rise and fall in the number of cases is the Netherlands. About 10 days after the Dutch government removed nearly all remaining coronavirus restrictions on June 26, cases are starting to rise. “It was really the peak of cases among young people,” Tom Wenslers, a biostatistician and evolutionary biologist at the Catholic University of Leuven in Belgium, told BuzzFeed News. As in the UK, this has not translated into a significant increase in hospitalizations or deaths.
However, the nation abruptly reversed course on July 9, closing nightclubs and restricting bars and restaurants to designated seating that remained 1.5 metres. “Most of the infections occurred in nightlife venues and at parties with large numbers of people,” the Dutch government said. in the current situation Announcing new restrictions.
The Dutch Delta wave peaked within two weeks of the new restrictions. If this rapid shift is indeed driven by the closing of nightclubs, it provides another encouraging message that the delta variant can be contained through more subtle changes in behavior than a complete closure.
“The UK and the Netherlands should be a counselor against despair,” Bill Hanage, an epidemiologist at Harvard T.H. Chan School of Public Health, told BuzzFeed News. “We don’t need to be fatalistic about the delta variable.”
Hanage is not the only one who believes that experience in European countries indicates that modest precautions such as wearing masks in public indoor spaces and avoiding large gatherings can make a big difference in the face of a delta variant.
“When you change behaviors, with or without formal policy changes, in a way that protects you from infection, we see that kind of shift,” Myers said.
Delta waves and vaccination against the Corona virus in the United States of America
As the chart above shows, states with lower vaccination rates thus far tend to experience more severe delta waves.
So in the long run, boosting vaccination in places where few people pick up remains the best hope of defeating the delta variant in the United States. But while vaccination rates is increasing more rapidly In the states currently experiencing the delta’s steepest rises, there’s a long way to go — and the people who get their first shot today won’t have strong protection for several weeks.
Asked at a White House press briefing Thursday what the United States should do to combat delta waves, Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, supported the idea that controls that helped reverse previous increases in altitude would work again.
“You can do that in the immediate sense right now by mitigating,” Fauci said. “Mitigating is the kinds of things that I’ve heard from the CDC recommendations, in terms of concealment, in terms of avoiding crowded situations where you can increase the ability of the virus to spread.”
“Vaccination is the end game for all of this,” Fauci added. But if the United States can mitigate the spread of the disease in the short term and boost vaccination rates in the long term, he said, “We will change the direction of the delta wave. I will guarantee you that will happen.”