Michigan and other states that experienced springtime Covid-19 surges or faced worrisome transmission trends appear to have turned a corner, with drops in new cases in recent days as vaccines reach more people.
After hovering at stubbornly high levels or increasing over the past two months, average daily cases in Massachusetts, Minnesota, New Jersey, Illinois, and other states in the Midwest and Northeast have started to fall, providing a breath of relief that the communities are past their most recent peaks. Crucially, new infections in Michigan which experienced the worst of the spring spikes, with some of its highest Covid-19 levels of the entire pandemic occurring in recent weeks have started declining, with hospitalizations also starting to tick down.
Experts are cautious that the progress has just begun and needs to be sustained if the states want to actually achieve low levels of transmission. But theyre heartened that it appears vaccines are increasingly not just protecting individuals from Covid-19, but are starting to have broader benefits for communities.
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Aprils been a bad month, said Preeti Malani, an infectious disease physician at the University of Michigan. There are hospitals across the state overwhelmed with patients. And because staff are sick, theyve been having trouble with staffing their hospitals. Different parts of the state remain under different levels of pressure, but now, with a big increase in vaccine availability in the past month, Malani said, Im optimistic about the direction were headed.
At the national level, the countrys average daily infection count has also started to come down, from more than 70,000 in the middle of April to closer to 60,000 now. But summarizing the U.S. Covid-19 epidemic from that frame obscures how much variability there is. After experiencing a horrific surge over the winter, California now has one of the lowest rates of infections in the country, while cases in Puerto Rico have increased over the past month.
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We remain in a complicated stage, Rochelle Walensky, the director of the Centers for Disease Control and Prevention, said at a briefing Monday. On the one hand, more people in the United States are being vaccinated every single day at an accelerated pace. On the other hand, cases and hospitalizations are increasing in some areas of the country, and cases among young people who have not yet been vaccinated are also increasing.
The progress in the United States stands in stark contrast to most of the rest of the world, which lacks anything close to the vaccine supply this country has. Persistently high cases in Europe and the Americas and huge spikes in Asia have driven global case counts to among the highest levels of the whole pandemic.
Trends can also be moving in the right direction when, in raw numbers, infections are still high. Cases may be coming down in Michigan, but theyre still higher than they were there at just about at any other point in the pandemic. National case counts in the 60,000 range as opposed to the, say, 20,000 range mean that many more people will suffer severe outcomes from the coronavirus. And while death counts have dropped dramatically from the more than 3,000 people taken daily in the United States in stretches of January and February, the progress has been stalled at more than 700 deaths per day. The hope is that if case counts continue to fall over the coming weeks, deaths will follow in turn.
Already, the rollout of vaccines has dramatically changed the dynamics of the U.S. epidemic. Hospitalization and death rates among older adults the population with the highest immunization coverage have plummeted, while hospitalizations among younger adults have also started to come down more recently. Whereas for the first year of the pandemic hospitalizations and deaths would follow case counts in predictable patterns, experts now speak of vaccines decoupling those metrics because they are so powerfully protective against the worst outcomes of the disease.
But the shots arent just protecting individuals. Increasing evidence shows that they take a substantial bite out of transmission once theyre given to a certain swath of the population, as countries like Israel that have vaccinated most of their populations have demonstrated. Its not a specific threshold it will vary place to place depending on other factors but experts are hoping and anticipating that some places in the U.S. could be nearing that point, and drops in case counts could accelerate.
I think that might be whats happening in the Upper Midwest, said infectious disease physician Monica Gandhi of UCSF.
Experts had expected that the vaccine rollout would suppress Covid-19 come this summer, to such low levels that many of the activities weve forsaken over the past year could be done relatively safely.
But there was an intermediate hurdle: In some states, cases started rising again this spring, as politicians eased restrictions and individuals grew more relaxed. More transmissible variants of the coronavirus pushed cases up or slowed progress most notably B.1.1.7, which ignited major outbreaks in the United Kingdom (where it first emerged) and then in other European countries. Some recent transmission in New York and New Jersey also seems to have been driven by another variant, B.1.526.
The declining case counts in Michigan and other states suggest we may be back on track.
Im hopeful for that, epidemiologist Stephen Kissler of Harvards T.H. Chan School of Public Health said about the U.S. dodging the full brunt of B.1.1.7. Im cautiously optimistic.
One reason is that the weather got warmer, which appears to have an impact on transmission both for behavioral reasons (people spend more time outdoors) and perhaps for biological ones (many respiratory viruses lose some of their transmission efficiency in hotter, more humid temperatures). B.1.1.7-fueled spikes in the U.K. and Europe were exacerbated because they occurred over the colder months, for example.
The U.S. also had a big wall of natural immunity blunting just how widely the virus could spread this spring. Experts estimate that more than 100 million people in the country have recovered from an infection the vast majority of whom remain protected against reinfection for now.
And then, of course, vaccines. More than half of adults in the U.S. have received at least one dose of a vaccine, and a full third of adults are fully vaccinated.
The factors that spur outbreaks or slow them the weather, the number of susceptible people, the virus itself, the precautions people take can compound or counteract each other, and the plateaued national case count in recent weeks is a reflection of an almost even tug-of-war. But it appears that the balance in more places appears to be tilting toward declines.
Our optimism that the country as a whole has reached a clear turning point is further reinforced, modelers at Childrens Hospital of Philadelphias PolicyLab wrote in their latest update on Wednesday. This is great news for a Covid-weary nation, but we are mindful that the rates of improvement for some areas will be quicker than others.
For all the progress achieved with vaccines, the U.S. is reaching the point where supply is outpacing demand in a growing number of communities. The average number of daily vaccines administered reached a peak of nearly 3.2 million earlier this month, but has since fallen to 2.8 million, even as all people 16 and up became eligible for the shots. Its a matter of both access and hesitancy, and health officials at every level will increasingly have to reach people where they are or assuage their concerns to get more shots in arms. The University of Michigans Malani, for example, raised the concern that teens and young adults could drive outbreaks if theyre not incentivized to get vaccinated.
Experts still foresee a summer when vacations and barbecues return. The coronavirus wont be gone from the United States, but at what level it circulates and how much damage it inflicts in large part depends on how many people in each area remain unvaccinated. (Most children still wont be vaccinated this summer, but experts say that high levels of vaccine coverage among adults and lower transmission rates generally will reduce spread among children as well. Children overall are far less vulnerable to severe outcomes from Covid-19 than older adults, and appear to transmit the virus at lower levels.)
One trend experts will be keeping an eye on this summer is if there are echoes of summer 2020. While the warmer weather gives states in the northern part of the country some breathing room, last summer brought large outbreaks in places like Texas and Florida, where summer temperatures drive people into air-conditioned indoors. If there are large pockets of people who remain susceptible to Covid-19 in those places, they could potentially see a repeat increase in cases if on a significantly smaller scale this summer.
Continued here:
States with springtime Covid-19 surges appear to have turned a corner - STAT
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