COVID shots still work, but researchers hunting new improvements

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COVID-19 vaccinations are at a critical juncture as companies test whether new approaches like combination shots or nasal drops can keep up with a mutating coronavirus—even though it’s not clear if changes are needed.

Already there’s public confusion about who should get a second booster now and who can wait. There’s also debate about whether pretty much everyone might need an extra dose in the fall.

“I’m very concerned about booster fatigue” causing a loss of confidence in vaccines that still offer very strong protection against COVID-19’s worst outcomes, said Dr. Beth Bell of the University of Washington, an adviser to the U.S. Centers for Disease Control and Prevention.

Despite success in preventing serious illness and death, there’s growing pressure to develop vaccines better at fending off milder infections, too — as well as options to counter scary variants.

“We go through a fire drill it seems like every quarter, every three months or so” when another mutant causes frantic tests to determine if the shots are holding, Pfizer vaccine chief Kathrin Jansen told a recent meeting of the New York Academy of Sciences.

Yet seeking improvements for the next round of vaccinations may seem like a luxury for U.S. families anxious to protect their littlest children — kids under 5 who are not yet eligible for a shot. Moderna’s Dr. Jacqueline Miller told The Associated Press that its application to give two low-dose shots to the youngest children would be submitted to the Food and Drug Administration “fairly soon.” Pfizer hasn’t yet reported data on a third dose of its extra-small shot for tots, after two didn’t prove strong enough.


The original COVID-19 vaccines remain strongly protective against serious illness, hospitalization and death, especially after a booster dose, even against the most contagious variants.

Updating the vaccine recipe to match the latest variants is risky, because the next mutant could be completely unrelated. So companies are taking a cue from the flu vaccine, which offers protection against three or four different strains in one shot every year.

Moderna and Pfizer are testing 2-in-1 COVID-19 protection that they hope to offer this fall. Each “bivalent” shot would mix the original, proven vaccine with an omicron-targeted version.

Moderna has a hint the approach could work. It tested a combo shot that targeted the original version of the virus and an earlier variant named beta—and found vaccine recipients developed modest levels of antibodies capable of fighting not just beta but also newer mutants like omicron. Moderna now is testing its omicron-targeted bivalent candidate.

But there’s a looming deadline. FDA’s Dr. Doran Fink said if any updated shots are to be given in the fall, the agency would have to decide on a recipe change by early summer.


For the average person, two doses of the Pfizer or Moderna vaccine plus one booster—a total of three shots—“gets you set up” and ready for what may become an annual booster, said Dr. David Kimberlin, a CDC adviser from the University of Alabama at Birmingham.

After that first booster, CDC data suggests an additional dose offers most people an incremental, temporary benefit.

Why the emphasis on three shots? Vaccination triggers development of antibodies that can fend off coronavirus infection but naturally wane over time. The next line of defense: Memory cells that jump into action to make new virus-fighters if an infection sneaks in. Rockefeller University researchers found those memory cells become more potent and able to target more diverse versions of the virus after the third shot.

Even if someone who’s vaccinated gets a mild infection, thanks to those memory cells “there’s still plenty of time to protect you against severe illness,” said Dr. Paul Offit of the Children’s Hospital of Philadelphia.

But some people—those with severely weakened immune systems—need more doses up-front for a better chance at protection.

And Americans 50 and older are being offered a second booster, following similar decisions by Israel and other countries that offer the extra shot to give older people a little more protection.

The CDC is developing advice to help those eligible decide whether to get an extra shot now or wait. Among those who might want a second booster sooner are the elderly, people with health problems that make them particularly vulnerable, or who are at high risk of exposure from work or travel.


It’s hard for a shot in the arm to form lots of virus-fighting antibodies inside the nose where the coronavirus latches on. But a nasal vaccine might offer a new strategy to prevent infections that disrupt people’s everyday lives even if they’re mild.

“When I think about what would make me get a second booster, I actually would want to prevent infection,” said Dr. Grace Lee of Stanford University, who chairs CDC’s immunization advisory committee. “I think we need to do better.”

Nasal vaccines are tricky to develop and it’s not clear how quickly any could become available. But several are in clinical trials globally. One in late-stage testing, manufactured by India’s Bharat Biotech, uses a chimpanzee cold virus to deliver a harmless copy of the coronavirus spike protein to the lining of the nose.

“I certainly do not want to abandon the success we have had” with COVID-19 shots, said Dr. Michael Diamond of Washington University in St. Louis, who helped create the candidate that’s now licensed to Bharat.

But “we’re going to have a difficult time stopping transmission with the current systemic vaccines,” Diamond added. “We have all learned that.”

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8 thoughts on “COVID shots still work, but researchers hunting new improvements

    1. The above is a great example of how to tell us you don’t understand modern medicine without telling us you don’t understand modern medicine.

      The decoupling of infections from hospitalizations is what’s enabling us to move past COVID and if you that’s solely due to better medical care and favorable mutations, with no impact at all from vaccines, then I’d like to suggest that maybe following the latest medical advice from that wise conservative sage Tucker Carlson has affected more than your reproductive organs.

    2. Sure, Joe B, sure. If Albert Bourla and Fauci told all you lemmings to walk off the cliff to rid us of this plague, you would have. Just admit the L and that you followed frauds who should be in jail, or worse.

    3. Lemmings? You’re projecting.

      Meanwhile, we should all just take hydroxychloroquine…
      No, ivermectin…
      Maybe drinking bleach…
      Heck, just drink your urine …

      And if you dare question that, you know, that this laundry list of goofy “cures” seem more like a prank on some reality TV show that aren’t going to work … you’re just a woke liberal.

      Jail or worse. Sure. Adorable. By the way, when did you come to think all of the solutions to your problems was to turn America into Putin’s Russia?

    4. Joe B, I’ve probably read 250 non-fiction history books since this plague started. I’ve read about horrifying epidemics that wiped out 30-60% of populations, and then the novel ones in the “New” World that were even worse. I’ve read books that basically skipped over or lightly alluded to the “Spanish” flu, which was far, far more devastating than this one. This is barely a blip in world history, except for the extreme government overreaction to it. We didn’t survive because of masks, tests, jabs, social distancing, or the Evil Brainard shutting down the Monon Trail. We survived because (despite McD’s and its ilk) we have access to nutritious food, clean water, and warmth. And this bug disproportionately took out those whose bodies because of either age or lifestyle choices (more McD’s than walks on the Monon Trail) couldn’t keep or didn’t have pre-existing strong enough natural defenses to it. And of course, like every disease, some people just had bad luck, just like the 409 pounder 84 year olds who survived even before the jab.

    5. I am glad you read a lot of books but it doesn’t appear to me you learned anything from them. I assume you also read about how people refused to wear masks in the 1918 flu pandemic and spouted the same nonsense. Or how some cities didn’t have parades while others did and had resulting spikes in flu cases.

      Extreme government overreaction? Maybe in China. But barring some insane new variant the pandemic is over in this country. I found the pandemic restrictions not that bad and a minor blip in my lifetime. And while it’s fun to think I’m the triple masked guy everywhere I go to this moment, I type this unmasked in a large indoor space and I don’t see anyone masked either and that’s just fine by me.

      Reality is that some people decided to make a pandemic political when there was no need and more people died than needed to, because we had the tools to save hundreds of thousands more of American lives and people chose to die instead because they can’t handle the idea that some people are smarter than they are. And some other people died of heart attacks or strokes because the hospitals were full of people with COVID who could have been at home with a much milder case. That makes me a little bit sad, because those were people’s family members and I guess I am just too pro-life to think that old or fat people have it coming and well, they should just die off anyway.

    6. Joe B.- I don’t care what everybody else says, you are an outstanding person. Please do more research before posting.