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Medicine

Previous Covid Prevents Delta Infection Better Than Pfizer Shot (bloomberg.com) 311

An anonymous reader quotes a report from Bloomberg: People who recovered from a bout of Covid-19 during one of the earlier waves of the pandemic appear to have a lower risk of contracting the delta variant than those who got two doses of the vaccine from Pfizer and BioNTech SE. The largest real-world analysis (PDF) comparing natural immunity -- gained from an earlier infection -- to the protection provided by one of the most potent vaccines currently in use showed that reinfections were much less common. The paper from researchers in Israel contrasts with earlier studies, which showed that immunizations offered better protection than an earlier infection, though those studies were not of the delta variant.

The results are good news for patients who already successfully battled Covid-19, but show the challenge of relying exclusively on immunizations to move past the pandemic. People given both doses of the Pfizer-BioNTech vaccine were almost six-fold more likely to contract a delta infection and seven-fold more likely to have symptomatic disease than those who recovered. The analysis also showed that protection from an earlier infection wanes with time. The risk of a vaccine-breakthrough delta case was 13-fold higher than the risk of developing a second infection when the original illness occurred during January or February 2021. That's significantly more than the risk for people who were ill earlier in the outbreak. Giving a single shot of the vaccine to those who had been previously infected also appeared to boost their protection. The long-term benefit of a booster dose of the inoculation, which has just recently begun in Israel, is unknown.

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Previous Covid Prevents Delta Infection Better Than Pfizer Shot

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  • Numbers, please (Score:5, Insightful)

    by YrWrstNtmr ( 564987 ) on Saturday August 28, 2021 @10:43AM (#61738371)
    "6-fold", "7-fold" means little.

    0.06% is '6-fold' more than 0.01%. But still tiny.

    However, 18% vs 3% is also '6-fold'. But much much worse.
    • by fazig ( 2909523 )
      And while we're at it, perhaps it would be good to also have numbers for people that were neither vaccinated nor have had a previous infection.

      Because I'm already seeing stupid people inferring from the lack of that metric that vaccinated people are 7 fold more likely to XYZ than vaccinated people in general, omitting that a previous infection that went well is an important factor in these findings.
    • And how do those killed by their first bout with Covid19 factor into this statistic? Not at all, I suppose. Which means those infected a second time is a biased sample excluding the most vulnerable.
    • by DRJlaw ( 946416 )

      "6-fold", "7-fold" means little.

      "6-fold", "7-fold" means nothing. The first group had a 100% chance of getting COVID - that was the very basis for group identification and selection. The other group had a far lesser chance of getting COVID, because they'd been vaccinated.

      They're comparing apples and oranges. The chance of getting reinfected a second time versus the chance of getting infected a first time post vaccination. And, of course, they're not including those who didn't survive to get reinfected a

  • misleading troll (Score:5, Insightful)

    by dfghjk ( 711126 ) on Saturday August 28, 2021 @10:54AM (#61738395)

    "The results ... show the challenge of relying exclusively on immunizations to move past the pandemic."

    No they don't, not at all. Immunity based "exclusively on immunizations" provides good protection, whether that protection is better or worse doesn't say a damn thing about any "challenge". Furthermore, people who have had COVID AND received a vaccine afterwards are better protected still.

    This is just more anti-vaccine bullshit.

    • by jacks smirking reven ( 909048 ) on Saturday August 28, 2021 @11:05AM (#61738413)

      When people say that we should rely on "natural immunity" they mean "let everyone get COVID no matter the outcomes so long as I don't need be inconvenienced in any way or have to give any thoughts to the concerns of other people".

      It's stupid and selfish and says a lot about whoever is saying it.

      • Re: (Score:3, Insightful)

        The fuck your feelings crowd foaming at the mouth over a store asking them to wear a thin paper mask.

        The government can't tell me what to do they cry, unless it's:

        Two people of the same gender getting married
        A woman wanting an abortion
        Ingesting recreational drugs
        (and this is my favorite) Black people wanting to open carry firearms https://en.wikipedia.org/wiki/... [wikipedia.org]

      • Is there really a 'no vaccinations for anyone' crowd? I see 2 big crowds, characterized by forced and voluntary vaccinations. You're also mischaracterizing the arguments from the voluntary group: 1. Because natural immunity is derived from an encounter with the virus, it is more generally protective against variants; the immunity isn't for a single protein, like from the mRNA vaccines. 2. The evolutionary pressure caused by widespread vaccinations helps variants. 3. The old, fat, and frail could self-isola
    • I always speak with my financial advisor when it comes to inferring data from medical studies. Next I'm asking my dentist if running 14AWG romex is sufficient for an electric stove.

    • by sjames ( 1099 )

      Also worth noting, even with the infection rate as it is now, a fair number of places have their hospitals on full divert due to an overload of COVID cases. At least in Georgia, the National Guard is being deployed to hospitals to help manage the crisis. We don't have the resources necessary to handle the natural immunity route.

      As for the study, if true, it doesn't address the aggregate morbidity and mortality. That is, the odds of an un-vaccinated person who gains immunity through a COVID infection dying,

      • by dryeo ( 100693 )

        The real problem, at least where I am (BC), is the health care workers are burning out. Doesn't matter if you have lots of ICU units and ventilators available if you don't have qualified Doctors and Nurses to run things. Considering we've handled the pandemic better then most and still have the problems with burnout, I hate to think about these places that refuse to have any preventative practices.

    • by ceoyoyo ( 59147 )

      Even better, get vaccinated, *then* get exposed to COVID.

  • by tekram ( 8023518 ) on Saturday August 28, 2021 @10:57AM (#61738403)
    The caveat is ' though those studies were not of the delta variant.' This is like comparing apples and oranges or baseball stats against football stats. There is little data on how well previous COVID-19 infections can slow the progression of the Delta variant not to mention the risk of a 10 to 30 times higher mortality rates of a COVID-19 infection.
    • by dryeo ( 100693 )

      I did read of a study, likely not in actual people, that showed the Alpha variant seemed to give better protection against all strains, especially compared to the original variant.
      Truthfully, we're still early in doing good studies with many just saying that we need more good data.

    • Biggest thing about the Delta variant is that the old wisdom of children not being a source of transmission is completely off the table. As far as I am aware no-one in the world is vaccinating under 12s and while previously not an issue with Delta it is one of the primary sources of transmission.
  • by puck01 ( 207782 ) on Saturday August 28, 2021 @11:07AM (#61738419)

    First, its really disturbing to me the authors are publishing a non-peer reviewed study and acting like this is the only possible conclusion.

    Any person with no immune protection fares worse.

    Look at the data close enough and you'll see there was still some benefit to vaccination after infection.

    The media is a huge part of mis-information problem. Their headlines are misleading and frankly they have no business reporting on non-peer reviewed data.

    • All of Michael's is in China ...

    • by ufgrat ( 6245202 )

      Nowhere did they say there was no benefit to vaccination. They simply stated that people who had covid previously had better immune response compared to vaccination. This isn't even news-- Multiple studies have shown that in order of immune response, it's "none", "vaccinated", "survivor" and "survivor + vaccinated".

      The delta variant has made things more complicated, since it's apparently better at re-infection, or breaking through the vaccination, but your chances are still better if you've been vaccinate

    • by fazig ( 2909523 )
      I've read about this on https://www.sciencemag.org/new... [sciencemag.org] and I'm rather surprised that I find the Bloomberg version rather than the Sciencemag version here on Slashdot. But that's besides the point.

      Bloomberg did include this one paragraph:

      Giving a single shot of the vaccine to those who had been previously infected also appeared to boost their protection. The long-term benefit of a booster dose of the inoculation, which has just recently begun in Israel, is unknown.

      Though that's very far down and not a

  • by ffkom ( 3519199 ) on Saturday August 28, 2021 @11:11AM (#61738439)
    The good news in this is that almost everyone can develop decent immunity against both symptomatic disease and infection by being infected. Either without a vaccination before infection (at an ~20-fold risk of symptomatic disease) or with a previous vaccination, for those who want to lower their risk of symptomatic disease upon their first infection.

    And the immunity "boosters" are "for free" in the same way that they are delivered for all the other circulating human corona viruses: In the form of subsequent infections (with possibly different variants) at a later time.

    None of this will cause Sars-Cov-2 to leave the planet, but there is a really good chance it will not bother us more than the other popular human Corona viruses do, like OC43.
    Unless of course you choose to live as a prisoner of fear forever, avoiding (re-)infections at all costs, with or without being vaccinated.
    • but there is a really good chance it will not bother us more than the other popular human Corona viruses do, like OC43.

      wait, you can run ethernet over that? full or half duplex?

      wow, didn't know we could just traceroute the virus away!

    • by Tough Love ( 215404 ) on Saturday August 28, 2021 @04:11PM (#61739387)

      I don't know which is more disturbing, your post or the people who modded it up. For one thing, immunity fades over a period of months for all known coronaviruses. This is well researched and well established. This explains why the same coronaviruses keep coming back each year as colds.

  • ICUs? (Score:5, Insightful)

    by MMC Monster ( 602931 ) on Saturday August 28, 2021 @11:38AM (#61738493)

    The ICUs are not full of patients who got the vaccine. Heck, the ERs are not full of patients who got the vaccine.

    (With a vaccine that is readily available,) getting infected with Covid-19 is a waste of hospital resources.

    • Re:ICUs? (Score:5, Interesting)

      by ceoyoyo ( 59147 ) on Saturday August 28, 2021 @12:40PM (#61738683)

      Insurance companies in the US are starting to talk about having unvaccinated COVID patients pay more for their treatment. It seems odd that it took them this long, but that'll light a fire under most of the "I don't wanna get the ouchie" crowd.

  • So what if I get a breakthrough Covid-19 infection after being vaccinated? I'm not worried about infection. I'm worried about life-threatening infection. Is that more likely in people vaccinated or those that aren't vaccinated?

    Also, a single shot for those that were previously infected seems to work there. Why not highlight that?

  • by rsilvergun ( 571051 ) on Saturday August 28, 2021 @12:08PM (#61738579)
    about 3 months vs 6 for the vaccine. Also the second illness if you do get it is often worse... or at least it was the last I looked at the research, who the hell knows with how fast things are changing. Though the shorter immunity has come up in the recent stuff I've read.

    What I do know is that there's folks who can't eat on their own because covid fucked up their nervous system. One of them got sent to jail for a year because of that dodgy "shotspot" software & got covid twice in jail.

    Finally, let's not forget the American Healthcare system. Spend a week in the hospital and you can expect at least a $5k bill. If you get "surprise billing" (yeah, there's a law against it, it's full of loopholes) expect $20-$30k. We spent $2.6 billion on completely unnecessary covid hospitalizations in the last 60 days alone. And by "we" I mean the people in the hospitals and the people who got vaxxed when their insurance premiums go up.

    Get your vaccine. Tell people you know to get their vaccine. Ask them what they'd do with an extra $10k in debt.
  • Shame on you, BeauHD, shame on you.

  • by ayesnymous ( 3665205 ) on Sunday August 29, 2021 @04:55AM (#61740725)
    I read recently that Moderna is better at preventing breakthrough Covid cases than Pfizer.

Always draw your curves, then plot your reading.

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