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Medicine

Are Experts Underselling the Effectiveness of Covid-19 Vaccines? (nytimes.com) 193

David Leonhardt won a Pulitzer Prize for commentary in 2011. This week in a New York Times newsletter, he argues that early in the pandemic experts around the world mistakenly discouraged mask use because of "a concern that people would rush to buy high-grade medical masks, leaving too few for doctors and nurses. The experts were also [at the time] unsure how much ordinary masks would help."

But are they now spreading a similarly misguided pessimism about vaccines? Right now, public discussion of the vaccines is full of warnings about their limitations: They're not 100 percent effective. Even vaccinated people may be able to spread the virus. And people shouldn't change their behavior once they get their shots...

"It's going to save your life — that's where the emphasis has to be right now," Dr. Peter Hotez of the Baylor College of Medicine said. The Moderna and Pfizer vaccines are "essentially 100 percent effective against serious disease," Dr. Paul Offit, the director of the Vaccine Education Center at Children's Hospital of Philadelphia, said. "It's ridiculously encouraging."

Here's my best attempt at summarizing what we know:

- The Moderna and Pfizer vaccines — the only two approved in the U.S. — are among the best vaccines ever created, with effectiveness rates of about 95 percent after two doses. That's on par with the vaccines for chickenpox and measles. And a vaccine doesn't even need to be so effective to reduce cases sharply and crush a pandemic.

- If anything, the 95 percent number understates the effectiveness, because it counts anyone who came down with a mild case of Covid-19 as a failure. But turning Covid into a typical flu — as the vaccines evidently did for most of the remaining 5 percent — is actually a success. Of the 32,000 people who received the Moderna or Pfizer vaccine in a research trial, do you want to guess how many contracted a severe Covid case? One.

Although no rigorous study has yet analyzed whether vaccinated people can spread the virus, it would be surprising if they did.

The article suggests less-positive messages are being conveyed in part because "As academic researchers, they are instinctively cautious, prone to emphasizing any uncertainty."

But the article ultimately concludes that in fact, "the evidence so far suggests that the vaccines are akin to a cure."
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Are Experts Underselling the Effectiveness of Covid-19 Vaccines?

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  • by ZorinLynx ( 31751 ) on Saturday January 23, 2021 @12:38PM (#60982568) Homepage

    Not only is under-promising and over-delivering better than the opposite, but it will also result in people still being careful after getting their vaccines. Shit can always go wrong; a batch can go bad and become ineffective, etc... So pushing the vaccination as a complete cure is not a good idea.

    • There is also the concern that a vaccinated individual can be an asymptotic carrier of the disease, and so by flaunting restrictions they could spread the virus to those who are not vaccinated.

      • by ufgrat ( 6245202 )

        Ok, I can understand that concern. How many cases have there been? Asymptomatic carriers, yes-- asymptomatic *vaccinated* carriers....? Haven't heard of one yet.

        There's a concern that the vaccine could lead to spontaneous human combustion-- but the evidence so far is fairly slim. ;)

        • Asymptomatic carriers, yes-- asymptomatic *vaccinated* carriers....? Haven't heard of one yet.
          a) they are the same
          b) not many ppl are vaccinated yet

      • by DevNull127 ( 5050621 ) on Saturday January 23, 2021 @04:09PM (#60983202)
        From the New York Times article:

        Although no rigorous study has yet analyzed whether vaccinated people can spread the virus, it would be surprising if they did. “If there is an example of a vaccine in widespread clinical use that has this selective effect - prevents disease but not infection - I can’t think of one!” Dr. Paul Sax of Harvard has written in The New England Journal of Medicine. (And, no, exclamation points are not common in medical journals.)

        https://www.nejm.org/covid-vac... [nejm.org]

        On Twitter, Dr. Monica Gandhi of the University of California, San Francisco, argued: “Please be assured that YOU ARE SAFE after vaccine from what matters - disease and spreading [twitter.com].”
        • by dryeo ( 100693 )

          There's still 6 weeks or whatever before the vaccinations have totally kicked in. Especially for the first couple of weeks after the first shot, people have not built up immunity, can still get sick, though likely of decreasing severity and be infectious.
          People are already asking if they have to continue to take precautions right after the first shot.

        • From your citation:

          Many commentaries on the results of the vaccine clinical trials cite a lack of information on asymptomatic infection as a limitation in our knowledge about the vaccines’ effectiveness. Indeed, this is a theoretical concern, since up to 40% of people who get infected with SARS-CoV-2 have no symptoms but may still transmit the virus to others.

          So, until we know whether the vaccines protect against asymptomatic infection, we should continue to emphasize to our patients that vaccination does not allow us to stop other important measures to prevent the spread of Covid-19. We need to continue social distancing, masking, avoiding crowded indoor settings, and regular hand washing.

          There are several good reasons to be optimistic about the vaccines’ effect on disease transmission. First, in the Moderna trial. opens in new tab, participants underwent nasopharyngeal swab PCR testing at baseline and again at week 4, when they returned for their second dose. Among those who were negative at baseline and without symptoms, 39 (0.3%) in the placebo group and 15 (0.1%) in the mRNA-1273 group had nasopharyngeal swabs that were positive for SARS-CoV-2 by PCR at week 4. These data suggest that even after one dose, the vaccine has a protective effect in preventing asymptomatic infection.

          Second, findings from population-based studies now suggest that people without symptoms are less likely to transmit the virus to others. Third, many of the vaccines in wide use powerfully protect against both disease and transmission, so much so that infection control is one of the main motivators behind some vaccine policies. opens in new tab.

          Since originally posting these comments, some of my colleagues have reminded me that certain vaccines allow asymptomatic colonization, and no doubt this will sometimes be true about the Covid-19 vaccines. Plus, the protective effect will never be 100%, which is why while case numbers are still high, we still recommend the use of social distancing and masking in public. These caveats notwithstanding, the likelihood that these vaccines will reduce the capacity to transmit the virus to others remains excellent. (Last reviewed/updated on 20 Jan 2021)

    • by peragrin ( 659227 ) on Saturday January 23, 2021 @01:40PM (#60982756)

      Not only that but you need two doses and 35 days to get to that 95% number. 7 weeks before you get protection.

      A single shot is 40-50% effective.

      My wife was at day23. 2 days after the second dose and then tested positive.( Her nursing home was testing all staff when they showed up to work. ). They are in the middle of their first outbreak. (Good for them). So far they are at 25% of staff and residents positive and zero cases needing oxygen.

      The vaccines may not be fully effective but general consensus is they are limited how bad you get sick. They have some pretty bad residents and they are all doing well.

      Want to know how this outbreak started ? 2 staff and several immediate family members of staff went to a mask less new years Eve party. Every single case can be traced back to that event.

      Because one group wanted to be selfish assholes. I have to take a 2 year old and a 6 months old to get their noses swabbed and tested. Under sell and state the 35 days.

    • by ceoyoyo ( 59147 ) on Saturday January 23, 2021 @02:26PM (#60982876)

      Public health is like herding cats, except the cats have guns, 1/4 of them are insane, even by cat standards, and they're all super gullible.

      There's an optimum strategy somewhere, but there are a lot of parameters.

    • Not only is under-promising and over-delivering better than the opposite, but it will also result in people still being careful after getting their vaccines.

      I agree with your premise. However I haven't seen *anybody* in a position of authority play down the effectiveness of these vaccines. In fact, I've read numerous stories lauding how amazingly high their effectiveness is in preventing COVID-19, especially in contrast with most of the vaccines we're familiar with.

      This guy may have won a Pulitzer ten years ago, but that doesn't mean he didn't pull this particular story out of some random bodily orifice.

    • by ufgrat ( 6245202 )

      Taken too far, however, it leads to "If it doesn't protect me, doesn't stop transmission, why should I bother?".

      Given how many people actually believe that masks don't have any benefit, it's hard to sell people on "well, you still need to wear masks, you still need to be careful where you go and who you meet, and it's not a cure, and it doesn't mean life will get back to normal any time (if ever), but YOU REALLY NEED TO GET VACCINATED!!!".

      The message is self-conflicting.

      • by sjames ( 1099 )

        So there's no point in police wearing bullet proof vests? Might as well save the expense?

    • In any case the rest of us don't know what David Leonhardt actually said because the link is paywalled. Don't do that.

    • by hey! ( 33014 )

      If you went around saying (as this Baylor doctor says) that these vaccines are "100% effective against *serious* disease", people would stop wearing masks after getting vaccinated. That wold be really bad because they could still pass the infection on to other people. This not only endangers people who haven't been vaccinated yet or who can't get vaccinated, if a lot of people behave this way it will put the day things return to normal off by months.

      The way the mathematics of herd immunity work, when you

  • by dmay34 ( 6770232 ) on Saturday January 23, 2021 @12:42PM (#60982588)

    This writer seems to be confused by the concept of "honesty". You see, many people -and I know it's weird- but many people actually try to say things that are "true".

    • But so does everyone who tells a lie, by leaving out parts of the truth ...

      The point is that some people pick up more on the cautiousness of doctors than on their honesty. To them is a doctor's modesty not helpful. Not everyone is the same, and some people do better when they get the whole truth, not only 90% of it. Some are even happy with side-effects as long as they know about everything. The modesty that some people show when they tell the truth gets occasionally misinterpreted as weakness, an attempted

    • by Registered Coward v2 ( 447531 ) on Saturday January 23, 2021 @03:54PM (#60983150)

      This writer seems to be confused by the concept of "honesty". You see, many people -and I know it's weird- but many people actually try to say things that are "true".

      Exactly. As TFA pointed out, ""As academic researchers, they are instinctively cautious, prone to emphasizing any uncertainty.". They don't deal in absolutes and tend to want to caveat statements because, well, nothing is certain and want to give an accurate factual statement. Unfortunately, some people take anything less than "this is perfect" as reinforcing their reasons not to take it, just as a 100% statement would be dismissed as a lie; i.e. peopel are basically stupid.

    • by fermion ( 181285 )
      Because everyone is used to marketing not a reasonable representation of the data and fact pattern. Some exploit whatever they can to their advantage or to meet their specific agenda. They neglect to add disclaimers because they believe it is complicated.

      For instance, no vaccine is absolutely safe or effective, but on balance the risks and befits are well known and well balanced. For instance few families are going to prevent their teens from driving even though car accidents is the leading cause of accid

  • by RyanFenton ( 230700 ) on Saturday January 23, 2021 @12:50PM (#60982600)

    That is, the window of time between getting the vaccine, waiting two weeks, getting the second dose, then waiting another two weeks.

    If the immune system hasn't picked up on the virus early enough - and you get the real thing - then yeah, some folks will blame the vaccine, not the lack of their own ability to distance when they were right next to the finish line.

    And not everyone's immune system, well, works - it should work for MOST everyone, but they're biological systems, and we have a very old population. That's why we're trying for the older populations first.

    But unfortunately, if you bill the vaccine as a cure - then the second a large number many of these folks get it - they'll bolt out the door.

    So yeah - a bit of early pessimism is probably helpful for the groups motivations.

    Not everyone sees their time as a resource to be carefully invested, with priorities for shared health for small inconveniences - many just see a marshmallow across a gap and rush off into an open pit and get hurt. Then they'll get angry that the pit hates their freedom even as you try and fill it in for them.

    Ryan Fenton

  • by Hrrrg ( 565259 ) on Saturday January 23, 2021 @12:57PM (#60982626)

    First, the possibility of asymptomatic transmission: When one of the vaccines was tested early-on in monkeys (I forget which one - it could have even been J&J or Novavax), the monkeys were protected from severe disease but still contracted asymptomatic disease in their noses. This would suggest that they are capable of spreading the virus while asymptomatic. Your mucous membranes are protected primarily by a different antibody (IgA) than the antibody they have been measuring for the vaccine efficacy (IgG). I don't know if any data showing that the vaccines generate an IgA response.

    The other factor, however, is behavioral. If you tell people they are in the clear after the vaccine and they stop wearing masks, how do enforce mask wearing and social distancing for everyone else? Do you check everyone's vaccine card? I have one - it's just printed on paper with some signatures and could easily be forged. Also, if some people are allowed to stop wearing masks, others would also stop wearing them even though they hadn't received the vaccine. This would fuel a third surge while we are still in the middle of the second.

    • From the New York Times article:

      Although no rigorous study has yet analyzed whether vaccinated people can spread the virus, it would be surprising if they did. “If there is an example of a vaccine in widespread clinical use that has this selective effect - prevents disease but not infection - I can’t think of one!” Dr. Paul Sax of Harvard has written in The New England Journal of Medicine. (And, no, exclamation points are not common in medical journals.)

      https://www.nejm.org/covid-vac [nejm.org]
      • by dryeo ( 100693 )

        There's still a time period, perhaps 5-6 weeks, before the vaccine completely kicks in. The day after the first shot, you are no safer even with being vaccinated.

    • by ceoyoyo ( 59147 )

      You have to be careful with this kind of thing. Those monkeys had COVID sprayed into their noses, probably massive doses of it. That observation admits the possibility that someone *might* be able to spread COVID after being vaccinated. It doesn't suggest that they can, nor even that it's a particularly likely possibility.

  • by Strider- ( 39683 ) on Saturday January 23, 2021 @01:01PM (#60982636)

    These mRNA vaccines are quite likely the greatest invention of the 21st century. Both the Moderna and BioNTech vaccines were created within a few days of the SARS-CoV2 genome being published. Everything since then has been QA and manufacturing.

    The technology itself holds the possibility of rapidly creating vaccines for many many other diseases, by allowing the rapid production of specific antibodies. Think a vaccine for Malaria; that would be life changing for a large part of the world. Or a machine in the basement of a hospital that can turn out custom vaccines for pretty much anything you can think of.

    What a time to be alive.

    • by ceoyoyo ( 59147 ) on Saturday January 23, 2021 @02:39PM (#60982898)

      Not just vaccines. The mRNA techniques are originally cancer therapies. There's been some work on using them against auto-immune diseases too, basically as anti-vaccines. And you can imagine that the ability to make your body produce specified proteins could be awfully useful against all sorts of genetic diseases. Their DNA cousins as well.

  • I think a lot of it is because statistics are hard, and nuance takes more effort than most people want.

    There is nuance in words like "effective and reducing the spread", versus medical "efficacy" at stopping the virus. There are people who feel anything less than 100% means useless, when for those who understand statistics and disease transmission see that even a 30% reduction can stop a disease in its tracks, even with the remaining 70%.

  • by klipclop ( 6724090 ) on Saturday January 23, 2021 @01:16PM (#60982680)
    Every article I've been reading is based on early release information and media acts as if it's 100% infallible information. Stupid incompetent click bait oriented news organizations should stop pressuring scientists from making guesses when it just takes time to get the real data.
  • It's not a scientific reason, it's a social one. However, it's no less important. They don't want to have a group of people that have gotten the vaccines and can do whatever they want, and a group that's still waiting. It's like eating a six course gourmet meal in front of a bunch of starving people, it will cause further civil unrest.
  • What I would like to know is what the effect is of giving a vaccine shot to someone who tests positive for COVID. Will it train the immune system to eliminate it before it becomes a serious infection? What if someone is already sick? Will it train the immune system to fight it off more efficiently, or is it too late to make a difference?

    I'm guessing the answer is that we just don't know. If so, I would love to see it tried.

    • by ceoyoyo ( 59147 )

      No. The human immune system responds just fine to a COVID infection. It's actually overly aggressive in the serious cases. Adding some extra spike protein via a vaccine isn't going to be very helpful.

      There are some vaccines that are effective in people who are infected with the disease, if administered early enough, but these tend to be in diseases where the pathogen is very good at hiding from the immune system.

  • by flink ( 18449 ) on Saturday January 23, 2021 @02:06PM (#60982818)

    My personal guess is that they are trying to preserve mask wearing among the general public. If the messaging was "once you are vaccinated you are completely in the clear", then I think given the bullshit and histrionics surrounding masks already, that people would just lie, say they are vaccinated, and stop wearing masks. If the message is "wear a mask regardless of whether you are vaccinated", it gives the anti-maskers one less excuse.

    • by ceoyoyo ( 59147 ) on Saturday January 23, 2021 @02:44PM (#60982918)

      One of the hysterical things about this pandemic has been the rugged individualist prepper types, supposedly ready to fend for themselves and shelter in their bunkers for years, whining about wearing a mask and wringing their hands over the mental health implications of having to stay home.

      • Your mental health comment reminded me... I do a ton of coaching of youth & HS sports. It's been very amusing to hear the same people argue how important it is to open schools and allow sports - for the mental health of the kids - while I know full well that in any other situation, if concern for the mental health of the kids/players were mentioned, they'd say "toughen up & stop being a snowflake" or similar. I guess there's something positive about arriving at a better place even if it's not nece
  • by jellomizer ( 103300 ) on Saturday January 23, 2021 @03:10PM (#60983000)

    It just means he is talented at explaining himself. Not that his content is factual or correct.

    I know the actual experts in a topic are often painful to listen to because they know and care so much about the details and get frustrated trying to over generalize a complex issue.

    It is like saying C++ is bad compared to Python because you can code faster in Python. You will open a can of worms with the coding experts who will get angry with you and explain so much detail that you would just not listen to them.

  • Nonsense (Score:5, Interesting)

    by zmooc ( 33175 ) <zmooc@NosPAm.zmooc.net> on Saturday January 23, 2021 @03:18PM (#60983024) Homepage

    (...) mistakenly discouraged mask use because of "a concern that people would rush to buy high-grade medical masks, leaving too few for doctors and nurses (...)

    That's nonsense. Before COVID-19, most research into the effectiveness of masks against viruses focused on influenza. And masks really don't help against influenza. That's what caused the initial discouraging of using masks; if what we knew about masks and influenza would also apply to COVID-19, using masks would only provide a false sense of security and would even increase infections, also due to the increased touching of your face that a mask encourages. Once it became clear that masks work much better against COVID-19 than they do against influenza, experts were very quick to change their advice.

    Also nonsense? That expert are understating the effectiveness of COVID-19 vaccines.

    Classical technique. Make up a problem, write something that opposes the problem. Get views. Profit.

    • Measures against SARS-nCov-2 still prevented influenza season (not some other such as common cold - rhinoviruses). It could be due to distancing, disinfectants, symptom screening, reduced travel and more attention to ventilation and filtering in some cases. But I wouldn't count masks out because flu can spread through small airborne droplets. It's not _only_ masks, that is.

    • And masks really don't help against influenza. That's what caused the initial discouraging of using masks
      Yes they do ... moron.

      Once it became clear that masks work much better against COVID-19 than they do against influenza, experts were very quick to change their advice.
      That is not what happened. The "anti mask" propaganda was simply plain stupid, that is all.

  • Sell them how nutrient supplements are sold ..ie, lie to them and say it never has any side effects and will cure everything from cancer to toenail fungus AND bring your ex-girlfriend back. With her best friend.

  • The problem (if there actually is a problem) is that the vaccine trials focussed on a single thing. Does using the vaccine result in less disease.

    The answer is yes.

    If you want to know if the vaccines also prevent transmission then you need to do additional trials to test that (and that is happening, but it is not something that happens overnight.)

    Until the results of further trials are available the fail-safe answer is that we don't know if getting vaccinated prevents transmission so continue with social di

  • Any headline that ends in a question mark can be answered by the word no.

    We do not have any reliable data as whether vaccinated people may be able to spread the virus. Some preliminary data suggests that the Moderna vaccine has about 65% efficacy in preventing spread. This number is not very reliable, and more studies have been planned to assess how likely for vaccinated people to spread the virus. Therefore, experts say that vaccination people still should wear a mask and practice social distancing until w

    • No. And not just because of Betteridge. COVID-19 is a really nasty, persistent disease. We're now starting to learn about "long COVID" where people are returning to hospital months after recovery & dying. We're also learning about people who had mild symptoms suffering months later from persistent cardiovascular & neurological effects, among others. Remember the WHO spokesperson admonishing those calling for "herd immunity" policies? This is one of many reasons why. If the vaccine doesn't provide 10
      • by dmpot ( 1708950 )

        So far, smallpox is the only human virus that was eradicated through vaccination. We have good chances to eradicate polio if we put a bit more efforts into it, but I am skeptical about eradication of SARS-CoV-2 any time soon. If you look at four seasonable coronaviruses, most people get re-infected with them every couple years or so (some people can be reinfected after a few months). Whether the re-infection happens due to the waning immune response or viral mutations that allow to avoid the immune response

    • Either a vaccine works or it does not.

      The idea that one vaccine works and prevents spreading and the other vaccine works but does not prevent spreading: is absurd - actually: idiotic

      • by dmpot ( 1708950 )

        Not all vaccines provide sterilizing immunity, so it is quite possible for a vaccine to protect against illness but not infection. Thus, in principle, vaccinated people can spread disease to others. Now, if you spoke about two different vaccines against the same virus, then I agree that is unlikely for one vaccine to protect against disease and infection but for the other one to protect only against disease. However, currently, we don't have any reliable data about any COVID-19 vaccine how it's effective at

  • Although no rigorous study has yet analyzed whether vaccinated people can spread the virus, it would be surprising if they did.
    If you are infected, of course you spread it. Does not matter if you are "immune" and your immune system kills it before you get seriously sick.

    No idea why this is even a topic/question etc. in our days. It is damn plain physics. Yes, I say physics as it is not relevant if you want to call it chemistry or biology.

  • From the CDC website:

    https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article

    "Face Masks In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks

    As far as masks are concerned, there is no difference between the mechan

  • The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.
    Charles Bukowski

The unfacts, did we have them, are too imprecisely few to warrant our certitude.

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