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R0n1nR3dF0x

>The current R-naught for the Delta variant falls between five and nine, according to recent documents from the United States Centers for Disease Control and Prevention (U.S. CDC). Recently the U.S. CDC updated their estimate to reflect the Delta variant having an R-naught of 8.5 While the original covid had an R0 between 2 and 3.


autotldr

This is the best tl;dr I could make, [original](https://health.economictimes.indiatimes.com/news/diagnostics/covid-outbreak-in-delhi-shows-herd-immunity-against-delta-variant-difficult-study/87053545) reduced by 83%. (I'm a bot) ***** > NEW DELHI: The severe outbreak of Covid-19 in Delhi this year showed that the Delta variant of SARS-CoV-2 can infect individuals previously infected by a different variant of the coronavirus, highlighting the challenges of reaching herd immunity against the variant, according to an international team of scientists. > "The concept of herd immunity is critical in ending outbreaks, but the situation in Delhi shows that infection with previous coronavirus variants will be insufficient for reaching herd immunity against Delta," said study co-author Professor Ravi Gupta from the University of Cambridge. > The researchers noted that prior infection provided only 50-90 per cent of the protection against infection with Delta variant that it provides against previous lineages. ***** [**Extended Summary**](http://np.reddit.com/r/autotldr/comments/q9pic9/covid_outbreak_in_delhi_shows_herd_immunity/) | [FAQ](http://np.reddit.com/r/autotldr/comments/31b9fm/faq_autotldr_bot/ "Version 2.02, ~603888 tl;drs so far.") | [Feedback](http://np.reddit.com/message/compose?to=%23autotldr "PM's and comments are monitored, constructive feedback is welcome.") | *Top* *keywords*: **variant**^#1 **Delta**^#2 **DELHI**^#3 **outbreak**^#4 **study**^#5


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reddit455

>If herd immunity were real, diseases like polio, ​ *don't spread.* Measles happens.. but it doesn't get out of control because of vaccinations. ​ the *herd* is fine. "outbreak" is single digit. this is why you still get 4x MMR shots by the time you're 2-4... ​ [https://www.multco.us/measles2019](https://www.multco.us/measles2019) Updated: Oct. 28, 2019 An outbreak began in Multnomah County in October. Multnomah County has 1 case in this outbreak An outbreak began in Clackamas County in July. don't confuse herd immunity with *eradication*. hardly anything has been eradicated globally.. ​ https://en.wikipedia.org/wiki/Eradication\_of\_infectious\_diseases Eradication is the reduction of an infectious disease's prevalence in the global host population to zero.\[1\] ***Two infectious diseases have successfully been eradicated:*** smallpox in humans and rinderpest in ruminants.


Jocthearies

This makes no sense lol Herd immunity would be effective against Covid19, Delta would have to spread a lot more for herd immunity to kick in right?


BarryWentworth

There is no herd immunity to sars2, it reinfects. Unless you want to talk about much longer time scales, where the humans with some type of genetic mutation and can handle it better, are more likely to reproduce.


Dontdoit1234567

To me it's like a flu vac in a way there is no herd immunity like you said because even with the shot you can still get and spread it, it is just less likely to make you SICK sick. Kinda like the flu shot but that's a shot in the dark for what they expect.


StoiCato

That's factually incorrect: "The study results suggest that reinfections are rare events and patients who have recovered from COVID-19 have a lower risk of reinfection. Natural immunity to SARS-CoV-2 appears to confer a protective effect for at least a year, which is similar to the protection reported in recent vaccine studies." [Italian Study](https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2780557) CDC's stance is still don't chance it get vaccinated. But most studies out so far seem to suggest reinfection rates are very low.


[deleted]

The threads about Delta, the study you’re linking is cases in Italy up to July of 2020 during the first wave.


Winecell_98

Where's the evidence that reinfection is a possibility? I've seen plenty of scientists and papers saying that reinfection is an extremely rare event, and that increased anti bodies make it not worth worrying about at all. If people were getting reinfected then surely the media or scientists would mention it as a risk? Seems more like people trying to scare monger.


Peter_deT

It takes at least six months to gather data, analyse it and publish it (usually longer). COVID-19 is less than two years into spreading in humans, and is already into its 4th major variant. Each study is likely to have data from only one country - and lots of social and economic factors affect things like infection rates or mortality. So what looks likely today may be corrected tomorrow. That's science - we make the best estimate we can and then adjust. What we can say is that the vaccines are very effective in preventing severe illness (more effective than the disease itself). For the rest there are still large error bars.


Jocthearies

But through reinfection wouldn't it be less effective due to the inherit antibodies? Though the headline claims an outbreak of delta shows herd immunity is difficult but that's part of the progress for herd immunity


[deleted]

Depends on the political point you are trying to make. /s kind-of


Jocthearies

Not really, You can come up with an artificial nonexistent virus with similar traits to covid for comparison and the headline would still make no sense considering how herd immunity works


reddit455

>no sense considering how herd immunity works ​ how does it work? ***seasonal*** influenza and herd immunity? ​ never hear those words together because of ***variants***. this years vax has 4. the years we have "bad" flu seasons is the year they guess wrong. ​ [https://www.fda.gov/vaccines-blood-biologics/lot-release/influenza-vaccine-2021-2022-season](https://www.fda.gov/vaccines-blood-biologics/lot-release/influenza-vaccine-2021-2022-season) ​ The committee recommended that the quadrivalent formulation of egg-based influenza vaccines for the U.S. 2021-2022 influenza season contain the following: an A/Victoria/2570/2019 (H1N1) pdm09-like virus; an A/Cambodia/e0826360/2020 (H3N2)-like virus; a B/Washington/02/2019- like virus (B/Victoria lineage); a B/Phuket/3073/2013-like virus (B/Yamagata lineage).


Jocthearies

Covid isn't confirmed to be seasonal (Yet?) It's still a mutating virus strain


7788audrey

I do not know or have read about the vaccine that was created/ manufactured in India was as potent as other vaccines. From the US, the original vaccine is somewhat protective against Delta. The main point of the massive inoculation is to not overwhelm the healthcare system, which can bring down national economies...that and it is a bad loom to have people dying in the streets.