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  • It’s Beginning to Look a Lot Like Another COVID Surge

    It’s Beginning to Look a Lot Like Another COVID Surge

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    When I called the epidemiologist Denis Nash this week to discuss the country’s worsening COVID numbers, he was about to take a rapid test. “I came in on the subway to work this morning, and I got a text from home,” Nash, a professor at the City University of New York, told me. “My daughter tested positive for COVID.”

    Here we go again: For the first time in several months, another wave seems to be on the horizon in the United States. In the past two weeks, reported cases have increased by 53 percent, and hospitalizations have risen by 31 percent. Virus levels in wastewater, which can provide an advance warning of spread, are following a similar trajectory. After the past two years, a winter surge “was always expected,” Nash said. Respiratory illnesses thrive in colder weather, when people tend to spend more time indoors. Thanksgiving travel and gatherings were likewise predicted to drive cases, Anne Rimoin, an epidemiologist at UCLA, told me. If people were infected then, their illnesses will probably start showing up in the data around now. “We’re going to see a surge [that is] likely going to start really increasing in velocity,” she said.

    Winter has ushered in some of the pandemic’s worst moments. Last year, Omicron’s unwanted arrival led to a level of mass infection across the country that we had not previously seen. The good news this year is that the current rise will almost certainly not be as bad as last year’s. But beyond that, experts told me, we don’t know much about what will happen next. We could be in for any type of surge—big or small, long or short, national or regional. The only certain thing is that cases and hospitalizations are rising, and that’s not good.

    The pandemic numbers are ticking upward across the country, but so far the recent increases seem especially sharp in the South and West. The daily average of reported cases in Mississippi, Georgia, Texas, South Carolina, and Alabama has doubled in the past two weeks. Hospitalizations have been slower to rise, but over the same time frame, daily hospitalizations in California have jumped 57 percent and are now higher than anywhere else in the United States. Other areas of the country, such as New York City, have also seen troubling increases.

    Whether the nationwide spike constitutes the long-predicted winter wave, and not just an intermittent rise in cases, depends on whom you ask. “I think it will continue,” Gregory Poland, a professor of medicine at the Mayo Clinic, told me. “We will pour more gas on the fire with Christmas travel.” Others hesitated to classify the uptick as such, because it has just begun. “It’s hard to know, but the case numbers are moving in the wrong direction,” Rimoin said. Case counts are unreliable as people have turned to at-home testing (or just not testing at all), though hospitalizations and wastewater readings remain reliable, albeit imperfect, metrics. “I’ve not seen a big enough change to call it a wave,” Susan Kline, an infectious-diseases expert at the University of Minnesota Medical School, told me.

    But what to call the ongoing trend matters less than the fact that it exists. For now, what happens next is anyone’s guess. The dominant variants—the Omicron offshoots BQ.1 and BQ.1.1—are worrying, but they don’t pose the same challenges as what hit us last winter. Omicron drove that wave, taking us and our immune systems by surprise. The emergence of a completely new variant is possible this year—and would change everything—but that is considered unlikely.

    The lack of data on people’s immune status makes it especially difficult to predict the outcome of the current rise. Widespread vaccination and infection mean we have a stronger wall of immunity now compared with the previous two winters, but that protection inevitably fades with time. The problem is, people fall sick asynchronously and get boosted on their own schedules, so the timing varies for everyone. “We don’t know anything about how long ago people were [vaccinated], and we don’t know anything about hybrid immunity, so it’s impossible to predict” just how bad things could get, Nash said.

    Still, a confluence of factors has created the ideal conditions for a sustained surge with serious consequences for those who get sick. Fading immunity, frustratingly low booster uptake, and the near-total abandonment of COVID precautions create ideal conditions for the virus to spread. Meanwhile, treatments for those who do get very sick are dwindling. None of the FDA-approved monoclonal antibodies, which are especially useful for the immunocompromised, works against BQ.1 and BQ.1.1., which make up about 68 percent of cases nationwide. Paxlovid is still effective, but it’s underprescribed by providers and, by one medical director’s estimate, refused by 20 to 30 percent of patients.

    The upside is that few people who get COVID now will get very sick—fewer than in previous winters. Even if cases continue to surge, most infections will not lead to severe illness because the bulk of the population has some level of immunity from vaccination, previous infection, or both. Still, long COVID can be “devastating,” Poland said, and it can develop after mild or even asymptomatic cases. But any sort of wave would in all likelihood lead to an uptick in deaths, too. So far, the death rate has remained stable, but 90 percent of people dying now are 65 and older, and only a third of them have the latest booster. Such low uptake “just drives home the fact that we have not really done a good job of targeting the right people around the country,” Nash said.

    Even if the winter COVID wave is not ultimately a big one, it will likely be bad news for hospitals, which are already filling up with adults with flu and children with respiratory syncytial virus, or RSV. Many health-care facilities are swamped; the situation will only worsen if there is a big wave. If you need help for severe COVID—or any kind of medical issue—more than likely, “you’re not going to get the same level of care that you would have without these surges,” Poland said. Critically ill kids are routinely turned away from overflowing emergency rooms, my colleague Katherine J. Wu recently reported.

    We can do little to predict how the ongoing surge might develop other than simply wait. Soon we should have a better sense of whether this is a blip in the pandemic or something more serious, and the trends of winters past can be helpful, Kline said. Last year, the Omicron-fueled surge did not begin in earnest until mid-December. “We haven’t even gotten to January yet, so I really think we’re not going to know [how bad this surge will be] for two months,” Kline said. Until then, “we just have to stay put and watch.”

    It is maddening that, this far into the pandemic, “stay put and watch” seems to be the only option when cases start to rise. It is not, of course: Plenty of tools—masking, testing, boosters—are within our power to deploy to great effect. They could flatten the wave, if enough people use them. “We have the tools,” said Nash, whose rapid test came out negative, “but the collective will is not really there to do anything about it.”

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    Yasmin Tayag

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  • How to Make Sense of This Fall’s Messy COVID Data

    How to Make Sense of This Fall’s Messy COVID Data

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    It is a truth universally acknowledged among health experts that official COVID-19 data are a mess right now. Since the Omicron surge last winter, case counts from public-health agencies have become less reliable. PCR tests have become harder to access and at-home tests are typically not counted.

    Official case numbers now represent “the tip of the iceberg” of actual infections, Denis Nash, an epidemiologist at the City University of New York, told me. Although case rates may seem low now, true infections may be up to 20 times higher. And even those case numbers are no longer available on a daily basis in many places, as the CDC and most state agencies have switched to updating their data once a week instead of every day.

    How, then, is anyone supposed to actually keep track of the COVID-19 risk in their area—especially when cases are expected to increase this fall and winter? Using newer data sources, such as wastewater surveillance and population surveys, experts have already noticed potential signals of a fall surge: Official case counts are trending down across the U.S., but Northeast cities such as Boston are seeing more coronavirus in their wastewater, and the CDC reports that this region is a hotspot for further-mutated versions of the Omicron variant. Even if you’re not an expert, you can still get a clearer picture of how COVID-19 is hitting your community in the weeks ahead. You’ll simply need to understand how to interpret these alternate data sources.

    The problem with case data goes right to the source. Investment in COVID-19 tracking at the state and local levels has been in free fall, says Sam Scarpino, a surveillance expert at the Rockefeller Foundation’s Pandemic Prevention Initiative. “More recently, we’ve started to see lots of states sunsetting their reporting,” Scarpino told me. Since the Pandemic Prevention Initiative and the Pandemic Tracking Collective started publishing a state-by-state scorecard of breakthrough-case reporting in December 2021, the number of states with a failing grade has doubled. Scarpino considers this trend a “harbinger of what’s coming” as departments continue to shift resources away from COVID-19 reporting.

    Hospitalization data don’t suffer from the same reporting problems, because the federal government collects information directly from thousands of facilities across the country. But “hospitalizations often lag behind cases by a matter of weeks,” says Caroline Hugh, an epidemiologist and volunteer with the People’s CDC, an organization providing COVID-19 data and guidance while advocating for improved safety measures. Hospitalizations also don’t necessarily reflect transmission rates, which still matter if you want to stay safe. Some studies suggest, for example, that long COVID might now be more likely than hospitalization after an infection.

    For a better sense of how much the coronavirus is circulating, many experts are turning to wastewater surveillance. Samples from our sewage can provide an advanced warning of increased COVID-19 spread because everyone in a public-sewer system contributes data; the biases that hinder PCR test results don’t apply. As a result, Hugh and her colleagues at the People’s CDC consider wastewater trends to be more “consistent” than constantly fluctuating case numbers.

    When Omicron first began to wreak havoc in December 2021, “the wastewater data started to rise very steeply, almost two weeks before we saw the same rise” in case counts, Newsha Ghaeli, the president and a co-founder of the wastewater-surveillance company Biobot Analytics, told me. Biobot is now working with hundreds of sewage-sampling sites in all 50 states, Ghaeli said. The company’s national and regional dashboard incorporates data from every location in its network, but for more local data, you might need to go to a separate dashboard run by the CDC or by your state health department. Some states have wastewater surveillance in every county, while others have just a handful of sites. If your location is not represented, Ghaeli said, “the wastewater data from communities nearby is still very applicable.” And even if your county does have tracking, checking up on neighboring communities might be good practice. “A surge in a state next door … could very quickly turn into a surge locally,” Ghaeli explained.

    Ghaeli recommends watching how coronavirus levels in wastewater shift over time, rather than homing in on individual data points. Look at both “directionality” and “magnitude”: Are viral levels increasing or decreasing, and how do these levels compare with earlier points in the pandemic? A 10 percent uptick when levels are low is less concerning than a 10 percent uptick when the virus is already spreading widely.

    Researchers are still working to understand how wastewater data correlate with actual infections, because every community has unique waste patterns. For example, big cities differ from rural areas, and in some places, environmental factors such as rainfall or nearby agriculture may interfere with coronavirus tracking. Still, long-term-trend data are generally thought to be a good tool that can help sound the alarm on new surges.

    Wastewater data can help you figure out how much COVID-19 is spreading in a community and can even track all the variants circulating locally, but they can’t tell you who’s getting sick. To answer the latter question, epidemiologists turn to what Nash calls “active surveillance”: Rather than relying on the COVID-19 test results that happen to get reported to a public-health agency, actively seek out and ask people whether they recently got sick or tested positive.

    Nash and his team at CUNY have conducted population surveys in New York City and at the national level. The team’s most recent survey (which hasn’t yet been peer-reviewed), conducted from late June to early July, included questions about at-home test results and COVID-like symptoms. From a nationally representative survey of about 3,000 people, Nash and his team found that more than 17 percent of U.S. adults had COVID-19 during the two-week period—about 24 times higher than the CDC’s case counts at that time.

    Studies like these “capture people who might not be counted by the health system,” Nash told me. His team found that Black and Hispanic Americans and those with low incomes were more likely to get sick during the survey period, compared with the national estimate. The CDC and Census Bureau take a similar approach through the ongoing Household Pulse Survey.

    These surveys are “a goldmine of data,” though they need to be “carefully designed,” Maria Pyra, an epidemiologist and volunteer with the People’s CDC, told me. By showing the gap between true infections and officially reported cases, surveys like Nash’s can allow researchers to approximate how much COVID-19 is really spreading.

    Survey results may be delayed by weeks or months, however, and are typically published in preprints or news reports rather than on a health agency’s dashboard. They might also be biased by who chooses to respond or how questions are worded. Scarpino suggested a more timely option: data collected from cellphone locations or social media. The Delphi Group at Carnegie Mellon University, for example, provides data on how many people are Googling coldlike symptoms or seeking COVID-related doctor visits. While such trends aren’t a perfect proxy for case rates, they can be a helpful warning that transmission patterns are changing.

    Readers seeking to monitor COVID-19 this fall should “look as local as you can,” Scarpino recommended. That means examining county- or zip-code-level data, depending on what’s available for you. Nash suggested checking multiple data sources and attempting to “triangulate” between them. For example, if case data suggest that transmission is down, do wastewater data say the same thing? And how do the data match with local behavior? If a popular community event or holiday happened recently, low case numbers might need to be taken with a grain of salt.

    “We’re heading into a period where it’s going to be increasingly harder to know what’s going on with the virus,” Nash told me. Case numbers will continue to be undercounted, and dashboards may be updated less frequently. Pundits on Twitter are turning to Yankee Candle reviews for signs of surges. Helpful sources still exist, but piecing together the disparate data can be exhausting—after all, data reporting and interpretation should be a job for our public-health agencies, not for concerned individuals.

    Rather than accept this fragmented data status quo, experts would like to see improved public-health systems for COVID-19 and other diseases, such as monkeypox and polio. “If we get better at collecting and making available local, relevant infectious-disease data for decision making, we’re going to lead healthier, happier lives,” Scarpino said.

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    Betsy Ladyzhets

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