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Tag: vaccine expert

  • How Bad Are America’s COVID-Vaccination Rates?

    How Bad Are America’s COVID-Vaccination Rates?

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    Relatively speaking, 2023 has been the least dramatic year of COVID living to date. It kicked off with the mildest pandemic winter on record, followed by more than seven months of quietude. Before hospitalizations started to climb toward their September mini-spike, the country was in “the longest period we’ve had without a peak during the entire pandemic,” Shaun Truelove, an infectious-disease modeler at Johns Hopkins University, told me. So maybe it’s no surprise that, after a year of feeling normalish, most American adults simply aren’t that worried about getting seriously sick this coming winter.

    They also are not particularly eager to get this year’s COVID shot. According to a recent CDC survey, just 7 percent of adults and 2 percent of kids have received the fall’s updated shot, as of October 14; at least another 25 percent intends to nab a shot for themselves or their children but haven’t yet. And even those lackluster stats could be an overestimate, because they’re drawn from the National Immunization Surveys, which is done by phone and so reflects the answers of people willing to take federal surveyors’ calls. Separate data collected by the CDC, current as of October 24, suggest that only 12 million Americans—less than 4 percent of the population—have gotten the new vaccine, according to Dave Daigle, the associate director for communications at the CDC’s Center for Global Health.

    CDC Director Mandy Cohen still seems optimistic that the country will come close to the uptake rates of last autumn, when 17 percent of Americans received the updated bivalent vaccine. But for that to happen, Americans would have to maintain or exceed their current immunization clip—which Gregory Poland, a vaccine expert at Mayo Clinic, told me he isn’t betting on. (Already, he’s worried about the possible dampening effect of new data suggesting that getting flu and COVID shots simultaneously might slightly elevate the risk of stroke for older people.) As things stand, the United States could be heading into the winter with the fewest people recently vaccinated against COVID-19 since the end of 2020, when most people didn’t yet have the option to sign up at all.

    This winter is highly unlikely to reprise that first one, when most of the population had no immunity, tests and good antivirals were scarce, and hospitals were overrun. It’s more likely to be an encore of this most recent winter, with its relative calm. But that’s not necessarily a comfort. If that winter was a kind of uncontrolled experiment in the damage COVID could do when unchecked, this one could codify that experiment into a too-complacent routine that cements our tolerance for suffering—and leaves us vulnerable to more.

    To be fair, this year’s COVID vaccines have much been harder to get. With the end of the public-health emergency, the private sector is handling most distribution—a transition that’s made for a more uneven, chaotic rollout. In the weeks after the updated shot was cleared for use, many pharmacies were forced to cancel vaccination appointments or turn people away because of inadequate supply. At one point, Jacinda Abdul-Mutakabbir, an infectious-disease pharmacist at UC San Diego, who’s been running COVID and flu vaccination in her local community, was emailing her county’s office three times a week, trying to get vaccine vials. Even when vaccines have been available, many people have been dismayed to find they need to pay out of pocket for the cost. (Most people, regardless of insurance status, are supposed to be able to receive a free COVID-19 vaccine.)

    [Read: Fall’s vaccine routine didn’t have to be this hard]

    The vaccine is now easier to find, in many places; insurance companies, too, seem to be fixing the kinks in compensation. But Abdul-Mutakabbir told me she worries that many of the people who were initially turned away may simply never come back. “You lose that window of opportunity,” she told me. Even people who haven’t gotten their autumn shot may be hesitating to try if they expect access to be difficult, as the emergency physician Jeremy Faust points out in his Inside Medicine newsletter.

    Plus, because the rollout started later this year than in 2022, many people ended up infected before they could get vaccinated and may now be holding off on the shot—or skipping it entirely. And some Americans have simply decided against getting the shot. The CDC reported that 38 percent don’t plan to vaccinate themselves or their children; earlier this fall, more than half of respondents in a Kaiser Family Foundation poll said they probably or definitely wouldn’t be signing up themselves or their kids. More than 40 percent of those polled by KFF remain doubtful, too, that COVID shots are safe—dwarfing the numbers of people worried about flu shots, and even about RSV shots, which are newer than their COVID counterparts.

    The consequences of low COVID-vaccine uptake are hard to parse. This year, like last year, most Americans have been vaccinated, infected, or both, many of them quite recently. COVID’s average severity has, for many months, been at a relatively consistent low. The last catastrophic SARS-CoV-2 variant—one immune-evasive enough to spark a massive wave of sickness, death, and long COVID—arrived two years ago. Barring another feat of viral evolution, perhaps these dynamics have reached something like a stable state, Justin Lessler, an infectious-disease modeler at the University of North Carolina at Chapel Hill, told me. So maybe the most likely scenario is a close repeat of last winter: a rise in hospitalizations and deaths that’s ultimately far more muted than any earlier in the outbreak. And the COVID-19 Scenario Modeling Hub, which Lessler co-leads alongside Truelove and a large cohort of other researchers, projects that “next year will look a lot like this year, whatever this year ends up looking like,” Lessler said.

    But predictability is distinct from peace. COVID has still been producing roughly twice the annual mortality that flu does; roughly 17,000 people are being hospitalized for the disease each week. SARS-CoV-2 infections also still carry a risk, far higher than flu’s, of debilitating some people for years. “And I do think we’re going to experience a winter increase,” Truelove told me. Even if this year’s COVID-vaccine uptake were to climb above 30 percent, models suggest that January hospitalizations could rival numbers from early 2023. Go much lower than that, and several scenarios point to outcomes being worse.

    Based on the limited data available, at least one trend is mildly encouraging: Adults 75 and older, the age demographic most vulnerable to COVID and that stands to benefit most from annual shots, also have the highest vaccine uptake so far, at about 20 percent. At the same time, Katelyn Jetelina, the epidemiologist who writes the popular Your Local Epidemiologist newsletter, points out that CDC data suggest that only 8 percent of nursing-home residents are up to date on their COVID shots. “That is what keeps me up at night,” Jetelina told me. Early National Immunization Surveys data also suggest that uptake is lagging among other groups that might fare less well against COVID—among them, rural populations, Hispanic people, American Indians and Alaskan Natives, the uninsured, and people living below the poverty line.

    Last winter was widely considered to be a bullet dodged, and the reactions to the coming months may be similar: At least it’s no longer that bad. Since the winter of Omicron, the country has been living with lower vaccine uptake while experiencing lower COVID peaks. But those lower peaks shouldn’t undermine the importance of vaccines. Infection-induced immunity, past vaccinations, improvements in treatments, and other factors have combined to make COVID look like a gentler disease. Add more recent vaccination to that mix, and many of those gains would likely be enhanced, keeping immunity levels up without the risks of illness or passing the virus to someone else.

    [Read: The one thing everyone should know about fall COVID vaccines]

    As relatively “okay” as this past year-plus has been, it could have been better. Missed vaccinations still translate into more days spent suffering, more chronic illnesses, more total lives lost—an enormous burden to put on an already stressed health-care system, Jetelina told me. For the flu, more Americans act as if they understand this relationship: This year, as of November 1, nearly 25 percent of American adults, and more than 20 percent of American kids, have gotten their fall flu shot. Most of the experts I spoke with would be surprised to see such rates for COVID vaccines even at the end of this rollout.

    If last winter was a preview of future COVID winters, our behaviors, too, could predict the patterns we’ll follow going forward. We may not be slammed with the next terrible variant this year, or the next, or the next. When one does arrive, though, as chances are it will, the precedent we’re setting now may leave us particularly unprepared. At that point, people may be years out from their most recent COVID shot; whole swaths of babies and toddlers may have yet to receive their first dose. Some of us may still have some immunity from recent infections, sure—but it won’t be the same as dosing up right before respiratory-virus season with protection that’s both reliable and safe. Systems once poised to deliver COVID vaccines en masse may struggle to meet demand. Or maybe the public will be slow to react to the new emergency at all. Our choices now “will be self-reinforcing,” Poland told me. We still won’t be doomed to repeat our first full COVID winter. But we may get closer than anyone cares to endure.

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    Katherine J. Wu

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  • Annual COVID Shots Mean We Can Stop Counting

    Annual COVID Shots Mean We Can Stop Counting

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    A couple of weeks ago, a friend asked me how many COVID shots I’d gotten so far. And for a brief, wonderful moment, I forgot.

    “Three,” I told them, before shaking my head. “No, actually, four.” I had no trouble recalling when I’d received my most recent shot (September). But it took me a moment to tabulate all the doses that had preceded it.

    By this point in the pandemic, a lot of people must be losing track. “I actually think this is a good thing,” says Grace Lee, a pediatrician at Stanford, and the chair of the CDC’s Advisory Committee on Immunization Practices. Now that so many Americans have racked up several shots or infections, she told me, the question is no longer “‘How many doses have you gotten cumulatively?’ It’s ‘Are you up to date for the season?’”

    The flip is subtle, but it marks a rethink of the COVID-vaccination paradigm. We’re at a define-the-relationship moment with these shots, when people are trying to commit—to normalize them as a routine part of our lives. At a September ACIP meeting, CDC officials noted that “we are changing the way we are thinking about these vaccines,” and trying to “get on a more regular schedule.” If COVID shots are here for good, then at least we can be rid of the bother of counting them.

    Read: It’s a bad time to be a booster slacker

    Counting doses was more apt early in the vaccine rollout, when it seemed that two jabs (or even one) would be enough to get Americans “fully vaccinated” and out of the danger zone. When more shots followed, they were often advertised with confusing finality: What some initially described as the booster was later retconned as the first booster after a second one was recommended for certain groups. But with immunity against infection more fragile than some hoped, and a virus that quickly shapeshifts out of antibodies’ grasp, those ordinal adjectives have stopped making sense. Until our vaccine tech becomes much more durable or variant-proof, repeat doses will be, for most of us, a fixture of the future—and it won’t do anyone much good to say, “‘I’m on shot 15’ or ‘I’m on shot 16,’” Angela Shen, a vaccine expert at Children’s Hospital of Philadelphia, told me.

    The numbers certainly matter when they’re small: It will continue to be important for people to count off their first few shots, for instance, especially those without a history of infections. But after that initial set of viral-spike-protein exposures, the total count is moot. In most cases, about three vaccinations or infections—preferably vaccinations, which are both safer and easier to accurately track—should be “enough to fully charge up the immune system’s battery” for the first time, says Rishi Goel, an immunologist at the University of Pennsylvania. Further COVID shots will help only insofar as they can recharge the battery toward max capacity when it starts to lose its juice. Scheduling a vaccine, then, becomes a matter of “how long it’s been since your last immunity-conferring event,” regardless of how many exposures a body has racked up, says Avnika Amin, a vaccine epidemiologist at Emory University.

    People who are immunocompromised may need four or more shots to establish that initial immunity charge, and their own (maybe smaller) peak capacity. But ultimately, the threshold effect they experience—a point of “diminishing returns”—is similar, says Marion Pepper, an immunologist at the University of Washington. Given how many vaccinations and infections the U.S. has now logged, the majority of Americans “can be done with counting,” she told me.

    If we’re going to shift our focus to timing shots, instead of counting them, we’ll have to schedule our shots smartly. Several prominent figures have already come out and said that yearly doses are a top choice. Albert Bourla, Pfizer’s CEO, has been pushing that idea since early 2021; Peter Marks, who heads the FDA’s Center for Biologics Evaluation and Research, has been delivering a similar line for several months. Even President Joe Biden has endorsed the annual approach, noting in a September statement that the debut of the bivalent shot heralded a new phase in COVID vaccination, in which Americans would receive a dose “once a year, each fall.”

    That plan is not unreasonable. Shots will have to come with at least some regularity, as variants keep rolling in and immunity against infection ebbs. But re-dose prematurely with a shot with similar ingredients, and the body—still hopped up from the previous dose—may destroy the vaccine before it has much effect, making it about as useful as charging a battery that’s already at 95 percent. SARS-CoV-2 antibody levels drop off steeply in the first six months following a vaccine dose, and then, the rate of drain slows down. It’s as if the immune system goes into “power-saver mode,” Goel told me, which means there might not be a huge difference between revaccinating twice a year or only once. Plus, living out much of the year with lower antibody levels is not as worrisome as it might sound. Although antibodies can be a rather useful proxy for our level of protection, especially against infection, they don’t paint the whole defensive picture: T cells and other fighters tend to stick around for far longer, maintaining safeguards against severe disease. (The immunocompromised and older people may still need more frequent COVID-immunity top-offs.)

    Read: Are we really getting COVID boosters every year forever?

    The optimal pace for COVID vaccination will also depend on the speed at which the virus spews out variants. A yearly schedule works for influenza, Shen told me, but “we know flu’s cadence.” SARS-CoV-2 hasn’t yet settled down into a predictable, seasonal pattern; its waves aren’t relegated to the chilliest months. The degree to which we, as the coronavirus’s hosts, tamp down transmission also matters quite a bit. Having more virus around puts more pressure on vaccines to perform, especially when there aren’t many other mitigation measures in place. If all this talk of “once a year, each fall” turns out to be another red-herring recommendation, Amin told me, it could undermine any messaging that follows.

    All of that said, the autumn regimen may yet stick around because it’s the easiest approach. Flu-shot uptake is far from perfect, but the messaging around it is “simple and clean,” says Rupali Limaye, a behavioral scientist and vaccine-attitudes researcher at Johns Hopkins. After dosing up twice in four weeks as infants, people are asked to get a yearly shot, and that’s it. Compare that with the most convoluted days of COVID vaccination, when people couldn’t dose up without accounting for their age, health status, number of previous doses, vaccine brand, time since last dose, and more. “That’s absolute overload,” Limaye told me. Complicated schedules burn people out—or dissuade them from showing up at all. This fall, when the bivalent shot debuted, a troubling proportion of Americans didn’t even know they were eligible.

    Encouraging COVID vaccines at the same, straightforward pace as flu shots would make it easy for people to sign up for both at once, and maybe, eventually, to get them in the same syringe. Vaccines tend to ride one another’s coattails, Shen told me. “In the fall, there’s a bump in other routine vaccines,” she said, because people “are already there for their flu shot.” It would also make a big difference if the COVID-vaccine recipes changed for everyone at the same time, as they do for flu.

    Read: When’s the perfect time to get a flu shot?

    If we’re going to pivot from numbering doses to timing them, we might as well take the opportunity to discard the term booster as well. Some people don’t understand what it means, Limaye told me, or they default to a logical question—How many more boosters will I need? Plus, booster may no longer fit the science. “When we start updating formulas, it’s not really a booster anymore,” Amin told me. That’s not how we generally talk about flu shots: I certainly couldn’t tell you how many “boosters” of that vaccine I’ve had. (I don’t know, maybe 14? 15?) Pivoting to a terminology of “seasonal shots” could make COVID vaccination that much more routine.

    So, fine, if anyone should ask: I’ve had (count ’em: one, two, three) four doses of the vaccine so far. But more important, I’ve gotten the shot most recently available to me.

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    Katherine J. Wu

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