Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror
×
Medicine

Moderna Recommends Covid-19 Vaccine Booster To Protect Against New Variants (wsj.com) 189

Moderna says it expects people who received its two-dose Covid-19 vaccine to need a booster shot in the fall [Editor's note: the link may be paywalled; alternative source] to keep strong protection against newer variants of the coronavirus. From a report: The company said its vaccine remains 90% effective against preventing Covid-19 disease for at least six months, but said it sees a decline in antibody levels after six months, especially against newer strains of the coronavirus including the Delta variant. In a Phase 2 study, a third shot of the original formulation showed robust antibody responses against Covid-19 variants of concern, Moderna said. Moderna Chief Executive Stephane Bancel said in an interview Thursday that the company plans to seek regulatory approval for its booster shots in September, after it analyzes data from ongoing trials.

He said the boosters are necessary because immunity will continue to wane over time and some vaccine recipients show a drop in neutralizing antibodies when exposed to some variants, including Delta. "We're playing it safe, not only for Delta but also for what's coming after," he said. "I don't think the virus is done." Moderna, whose vaccine was authorized for emergency use in December, said Thursday it intends to complete in August its submission to the Food and Drug Administration for full approval of its shot. Its larger rival Pfizer completed its submission in July and the FDA aims to approve it by next month. FDA officials say the vaccines are safe but acknowledge full approval could help combat vaccine hesitancy and ease the way for vaccine mandates as cases in the U.S. fueled by the Delta variant surge.

This discussion has been archived. No new comments can be posted.

Moderna Recommends Covid-19 Vaccine Booster To Protect Against New Variants

Comments Filter:
  • I suspect we need independent research on vaccine efficacy over time & which vaccination strategies will yield the best protection. We certainly can't afford to rely on big pharma to lead public policy on this. What they seem to be suggesting is a permanent state of alarm where everyone needs vaccines every 6 months.

    And yeah, sad fact remains that having reservoirs of millions of people infected with COVID means that new variants will continue to evolve. Any news on how much the vaccines reduce infectio

    • Correct, but just how much can it evolve before it changes itself out of a job?

    • I suspect we need independent research on vaccine efficacy over time & which vaccination strategies will yield the best protection. We certainly can't afford to rely on big pharma to lead public policy on this.

      We already have those. That's why it's not enough for a company to say its vaccine is effective to get regulatory approval. And once the vaccine is approved, immunization committees decide who should get it, in which order, and when.

      The 3rd dose could be approved, but end up only being recommended for say, those over 60. They could say a 3rd dose is recommended 1 or 2 years after the second dose.

      Any news on how much the vaccines reduce infection rates or is it only the rates of serious illness & death?

      We have some numbers on mild to moderate infections. Even some on asymptomatic infections but they are not as rel

    • by ffkom ( 3519199 )
      Sars-Cov-2 does not need humans to evolve into variants, as it can infect many different mammals, and scientists have found for example 40% of samples from a very common type of deer to show prior infection: https://www.biorxiv.org/conten... [biorxiv.org]
      • Every household dog and cat can have it.
        And they are usually completely asymptotic.

        A little bit scary: my wife has 11 cats (no worries it is on farm not in a living room), nearly all of them were sick lately - with inconclusive symptoms. Except for fever and hiding in a corner they had nothing spectacular.

    • Both Moderna and BioNtech/Pfitzer are mRNA based vaccines that only fire up anti body production

      Obviously you need a booster as long as the sickness is around.

      You could use a real virus based vaccine, that also boosts memory cells to remember the virus and remember how to produce the antibody.

      Any news on how much the vaccines reduce infection rates
      That is a kind of stupid question. Strictly speaking: reduction is ZERO.
      However if you are the peak of anti body levels in your body, the infection has no foot ho

      • Both Moderna and BioNtech/Pfitzer are mRNA based vaccines that only fire up anti body production

        No.
        https://www.nature.com/article... [nature.com]

        Obviously you need a booster as long as the sickness is around.

        No, see above.

        That is a kind of stupid question. Strictly speaking: reduction is ZERO.

        No, lowest reported efficacy for Delta is 39% and the highest is 88% depending on which study you believe. There are zero studies that assert the answer is 0.

        Wait ten years: when definitely no one who ever got Moderna/BioNtech has no anti bodies anymore: it is just like if they were not vaccinated.

        Not likely. People still have acquired immunity to SARS-CoV from nearly two decades ago.

  • Seems like by Fall they might want to have an update. The Moderna codes for the spike protein but the Delta spikes are different. And there are more variants now.

    • by mspohr ( 589790 )

      A booster will probably be needed but since we have new variants emerging frequently, I'll wait until the vaccines are updated to be effective against the new strains.

  • Assumptions (Score:5, Insightful)

    by Thelasko ( 1196535 ) on Friday August 06, 2021 @01:48PM (#61664349) Journal
    Antibodies are only one part of the body's immune system. They are making the assumption that fewer antibodies mean lower immunity. That may not be the case. Do they have data showing more break through infections as a result?
    • It's anecdotal but if you look through the provincetown breakthrough cases they had a very high vaccination rate and I suspect that many of the people there were vaccinated early, probably in Jan or Feb.
      • Re:Assumptions (Score:5, Insightful)

        by Thelasko ( 1196535 ) on Friday August 06, 2021 @02:51PM (#61664559) Journal
        So many problems with the Provincetown analysis.
        - Not a random sample
        - Test with high cycle counts were thrown out of the data
        - Poor statistical analysis

        This type of event is expected. It sounds counterintuitive, but with very high vaccination rates, most cases will be in vaccinated individuals

        Say you start with 1000 people, 85% get vaccinated, the rest don't. Of the 150 in the unvaccinated group, 60% come down with Covid-19. Of the 850 in the vaccinated group, the same proportion, 60%, would have come down with Covid-19. However, the vaccine prevents 80% of those cases. The final tally is 90 unvaccinated people with Covid-19, and 102 vaccinated people with Covid-19. More vaccinated people with Covid than unvaccinated. The higher the vaccination rate goes, the larger proportion of people with Covid will be vaccinated, until the virus dies out.
        • by narcc ( 412956 )

          So many problems with the Provincetown analysis.

          Tell me more!

          - Not a random sample

          Why is that a problem with that particular study? (Hint: You don't always want a random sample. You should have learned that in grad school.)

          - Test with high cycle counts were thrown out of the data

          What reason did the researchers give for excluding those? Why do you disagree?

          - Poor statistical analysis

          What was wrong? Did they select inappropriate tests? What should they have done differently?

    • But the numbers will tell, we only need to wait. It won't be an unknown.

    • by hey! ( 33014 )

      This may be one of those things that depends on context. If COVID cases were falling off or remaining at a very low level, it certainly wouldn't make sense to be talking about booster shots. But it's quite evident transmission is out of control; seven day case rates are rising basically everywhere, even places that have high vaccination rates. As antibody levels begin to drop in the vaccinated population, we'd expect vaccinated people to transmit more virus, even if they still have enough of an immune res

    • by e3m4n ( 947977 )
      I believe they mean in terms of 'neutralizing antibodies'. So basically when you have a high amount of neutralizing antibodies the virus is DoA entering your body. DoA would mean you show no symptoms and have no transmissible viral load. What the article does not explain, and this is what the WH is getting upset with journalists about, is that even when it happens the helper T-cells order the B-cells to make more antibodies, while the killer T-cells attack the infected cells. This creates a delay between in
      • Yeah, going back to "normal" messaging is going to be tough. What you say would seem to mean that boosters will be a good strategy for stamping out covid19, but even without a booster the absolute risk is low and comparable to other risks. In "normal" times a safe vaccine against a disease would be a no-brainer, even if the mortality chance was pretty low. Preventing any preventable disease is fundamentally worthwhile. But somehow the crazies have shifted everything so that even spreading a deadly disea
        • Out of all the anti-vaxx groups; the ivermectin ones drive me the most nuts. Theyd rather steal anti-parasitics from a feed store meant for pigs and cows, than take a shot tested on 2 Billion humans so far.
      • by ffkom ( 3519199 )

        I believe they mean in terms of 'neutralizing antibodies'. So basically when you have a high amount of neutralizing antibodies the virus is DoA entering your body.

        Not all antibodies are the same - in the mucosa, where the virus enters and replicates first, it would take IgA antibodies to provide sterilizing immunity. But intra-muscular vaccinations are known to primarily trigger IgG antibody production, not so much IgA.

        Instead of yet another intra-muscular booster shot, either some nasal spray vaccine or exposure to the actual virus would more easily trigger IgA production and thus lower transmission rates.

      • With mRNA based vaccines like BioNTech/Pfitzer and Moderna, there are no T-cells ready to fight infected cells: as there are basically no infected cells (and no you do not need to give a smart ass nitpicking answer).

        The "infected cells" only produce spike proteins which are free floating in the blood and lymph system. Hence they trigger antibody production. But don't teach T-cells how to find an infected cell.

        Those vaccines are for "minimal invasive" intervention during a pandemic (after all you do not want

  • Could the problem be the short interval between the two doses? 3-4 weeks is short, and studies have shown that a 12 weeks interval gives higher immune response.

    I wouldn't be surprised if a third dose was only required for those who respected the manufacturer's short wait time before the second dose.

    • by ffkom ( 3519199 )
      The data is just not in at this time to tell how long protection against symptomatic disease remains after vaccination. If that protection works fine, people could get their periodic "boosters" for free from natural infection - just as they do with the other established human Corona viruses.
      • We know it's at least 6 months. We do not know much beyond that. Chances are it's longer.
        If they are going to recommend a 3rd dose, I hope they are going to change the recipe for the variants.

  • That which does not kill will mutate and try again. And again. And again.

    • nah, viruses don't have "goal" of death just successful reproduction. It will mutate and might get better at infection. Death of hosts hinders reproduction and so I'd not expect deadlier virus in terms of percent infected dying. This is pretty much what we're seeing. Of course, nonfatal damage to organs might change.

      Boosters tuned to new variants, and shoving vaccine into people into people whether they want it or not, seems best.

  • Because I have several long trips coming up starting this month, I just took an antibody test to see if my Moderna shots (Feb-Mar) were holding up. They are, apparently. I will take a booster if it turns out that one is needed.

    From the way that Delta is scything through the unvaccinated population, I'm about to survive into a strange new world. By Thanksgiving, there will be a lot of empty time slots on talk radio. Will Jason Momoa win the bidding for Hannity's slot? In 2022, Congress will pass the new tax

  • I'm beginning to wonder about having got the J&J vaccine.

    I read that some of the pharmacies are beginning to stop issuing it (maybe they profit more from the 2-dose regimen) and I hear about Moderna and Pfizer testing boosters but nothing about J&J. I can't see any of the companies bothering to test their booster to a competitor's initial shot.

  • Adobe would be proud

"It's the best thing since professional golfers on 'ludes." -- Rick Obidiah

Working...