The #Delta is winning, for the moment, & the Global #coronavirus map shows that we’re failing to fight it. But the #pandemic will be over one day—but the way there is different now 1/
The virus will almost certainly be a permanent part of our lives, even as #vaccines blunt its ability to cause death and severe disease. Most people will meet the virus eventually; we must ensure that as many people as possible do so with two doses of vaccine in them 2/
The vaccines are working and working well. Vaccinated people are indisputably safer than unvaccinated people. But although vaccinated individuals are well protected, highly vaccinated communities can still be vulnerable, for 3 reasons: 3/
First, unvaccinated people aren’t randomly distributed. Instead, they tend to be geographically clustered and socially connected, creating vulnerable pockets that #Delta can assault. 4/
Second, #Delta could potentially spread from vaccinated people too—a point of recent confusion. Delta-infected people build up similar levels of virus in their nose regardless of vaccination status. 5/
Third, Delta’s extreme #transmissibility negates some of the community-level protection that vaccines offer. 6/
Furthermore, #HerdImmunity point where enough people are immune that outbreaks automatically fizzle out—likely cannot be reached through vaccination alone. 7/
There’s not really a way to solve the Delta problem through vaccination alone!
Though the Vaccines remain the best way for individuals to protect themselves, but societies cannot treat vaccines as their only defense. 8/
The #pandemic isn’t over, but it will be: The goal is still to reach the endgame with as little damage, death, & disability as possible. 9/
The “zero COVID” dream of fully stamping out the virus is a fantasy. Instead, the pandemic ends when almost everyone has immunity, preferably because they were vaccinated or alternatively because they were infected and survived. 10/
When that happens, the cycle of surges will stop, and the pandemic will peter out. The new coronavirus will become #endemic—a recurring part of our lives like its four cousins that cause common colds. 11/
It will be less of a problem, not because it has changed but because it is no longer novel and people are no longer immunologically vulnerable. 12/
Endemicity was always the likely outcome, but likely is now unavoidable. If #SARSCoV2 is here to stay, then most people will encounter it at some point in their life. That can be hard to accept, because many people spent the past year trying hard to avoid the virus entirely 13/
But “it’s not really the virus on its own that is terrifying. It’s the combination of the virus and a naive immune system. Once you don’t have the latter, the virus doesn’t have to be so scary.” 14/
If #endemicity is the future, then masks, distancing, and other precautions merely delay exposure to the virus—and to what end? 15/
There’s still so much for us to buy time for:
-Suppressing the virus gives schools the best chance of staying open
-It reduces the risk that even worse variants will evolve
-It gives researchers time to better understand the long-term consequences of breakthrough infections 16/
-Curbing the coronavirus’s spread also protects millions of #immunocompromised
-Finally, we simply need more time to reach unvaccinated people. 17/
Eventually, humanity will enter into a tenuous peace with the coronavirus. #COVID19 outbreaks will be rarer and smaller, but could still occur once enough immunologically naive babies are born. 18/
Adults might need #boosters once immunity wanes substantially, but based on current data, that won’t happen for at least two years.
The bigger concern is that new variants might evolve that can escape our current immune defenses 19/
The current pandemic surge and the inevitability of endemicity feel like defeats. They could, instead, be opportunities to rethink our attitudes about the viruses we allow ourselves to inhale. 20/
@edyong209 in a riveting story on the future of Covid19 👇
theatlantic.com/health/archive…

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More from @vipintukur

15 Aug
Will the newly identified sub-lineages of #Delta may initiate a new wave of #Covid19 in India? What impact the increasing prevalence of the Delta-D clade would have on global #COVID burden?

My write-up deliberating on these issues in @TheWireScience 👇 science.thewire.in/the-sciences/a…
#Delta variant and its extended family: How much do we need to worry?

During the first few months of the #pandemic, the evolution of the virus was relatively predictable, with substitutions accumulating at a fixed pace: 1 substitution every second week 2/
In contrast, the 2nd year of the #pandemic is punctuated by the emergence of several #variants that bore evidence of dramatic evolution 3/
Read 38 tweets
13 Aug
The new #MayoClinic study finds Vaccine Effectiveness (VE) of #Pfizer shot dropped to 42% against #Delta #SARSCoV2 infection (not against hospitalization & deaths). 1/

medrxiv.org/content/10.110… Image
Earlier unpublished reports from #Israel also indicated the same 2/ ImageImage
Few other recent studies have also placed the #VE of Pfizer mRNA vaccine between 40-60% against #SARSCoV2 infection/symptomatic disease but not against severe disease & deaths. Table by @EricTopol 3/ Image
Read 7 tweets
6 Aug
How well are the current #Covid vaccines performing?

In all fairness, we can say they are offering high protection against severe disease & deaths; considerable protection against the symptomatic disease; but only modest protection ag. infections/transmission of the disease 1/
To put it another way, the vaccines are contributing little to our fight against the frequent surges of the #SARSCoV2 virus.

This leads to one pertinent question:

What ought to be the prime objective of the vaccination particularly amid an intense pandemic? 2/
To resist the ongoing outbreak or avoid hospitalizations and deaths?

A four-fold reduction in the hospitalisation & death rates is not much use if we just allow infections to reach four-fold the previous peak. 3/
Read 32 tweets
5 Aug
#Moderna says its vaccine shows durable 93% efficacy through 6 months.

Final analysis (median follow-up 5.3 mo):

-Against COVID19: 93.2%
-Against severe COVID19: 98.2%
-Against death: 100%

(Note: All data prior delta) 1/
Further break down of #Moderna efficacy by 2-month segments post 2nd dose; at month 4+, efficacy is 92.4%

#Pfizer vax (by months 4-6) efficacy is 84% - though against severe disease maintains 97%. 2/
Yet it expects antibody levels will start to wane, and with #delta there will be an increase in #breakthrough infections in fully vaccinated; it sees need for #boosters 3/
Read 8 tweets
12 Jul
For how long protection against reinfection with #SARSCoV2 lasts after a symptomatic #Covid19 disease? Almost FIVE YEARS, according to a new modelling study 1/
papers.ssrn.com/sol3/papers.cf…
The duration of immunity in #SARSCoV2 infected people remains unclear. Recent studies have estimated that the correlate of 50% protection from re-infection was 20% of the mean convalescent #NAbs titre 2/
The sera collected from a cohort of 125 individuals with RT-PCR confirmed SARSCoV2 infections up to 386 days after symptom onset. In the subset of 65 sera collected from day 151 to 386 after symptom onset, all remained positive in PRNT50 3/
Read 10 tweets
11 Jul
A recent #Chinese study shows that the viral loads in the #Delta infections were ~1000 times higher than those in the earlier 19A/19B strain infections on the day when viruses were firstly detected 1/

virological.org/t/viral-infect…
#Delta not only had a shorter incubation period but also has a shorter latent period. So, the time difference stayed the same but with much higher viral load. That's terrible & explains near-vertical waves 2/
Because it binds & replicates faster, #Delta creates a higher viral load which triggers symptoms in a host much faster 3/
Read 8 tweets

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