The overwhelming evidence for 3rd shot boosters *before* Omicron, reinforced by new data for benefit vs Omicron 1. The randomized trial of 3 shots vs 2 shots + placebo, 95% efficacy for preventing symptomatic infections across all age 16+ groups (N=10,125) cdc.gov/vaccines/acip/…
3. Marked reduction of hospitalizations and deaths in over 728,321 people with 3 shots vs matched 728,321 people with 2 shots, across all age groups thelancet.com/action/showPdf…
4. Now vs Omicron, the variant with substantial immune escape, the 3rd shot induced a 25-fold increase in neutralizing antibody titer pfizer.com/news/press-rel…
Clinical correlation with effectiveness data and duration of impact pending
PS I am getting very tired of people ("experts," CDC, journalists) negating the incontrovertible evidence for 3rd shots that existed prior to Omicron, which is one of the reasons why less than 1 in 4 US adults have had boosters
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First data on booster vaccine effectiveness vs Omicron (581 cases): drop in protection vs symptomatic infection by 2 doses (AZ ->0, Pfizer-> <40%) restored to ~75% with 3rd shot Pfizer assets.publishing.service.gov.uk/government/upl…@UKHSA
The 95% CI presented here with relatively small number of Omicron cases overlap vs Delta, but certainly suggest less protection after 3rd dose.
For Omicron, essentially no protective effect of 2 AZ doses, 3rd goes to 71% (42,86); 2 Pfizer doses to 34%, 3rd doses to 76% (56,83)
Much more new beyond 1st look at Omicron vaccine effectiveness, summarized in a terrific thread by @kallmemeg
Great credit to this team for quickly getting us Omicron lab neutralization data. The bright side is that there is incomplete immune escape from vaccination👍
For people who had Prior Covid plus vaccination, the preserved Omicron neutralization level (FRNT) likely reflects solid protection. Not seen with 2 doses of Pfizer vaccine, but would expect that a 3rd shot, with its marked effect on raising nAbs, would simulate that
Here are some relevant data for the small sample. The 6 vaccinated individuals range from 10-39 days post-vaxx.
Take home point is how powerful hybrid immunity (vaccine + prior Covid) vs all variants that we've seen now, including Omicron
Does Omicron lead to less severe illness than prior variants ? We don't yet but let's review what is the basis for the hope /1 nytimes.com/2021/12/06/wor…
In South Africa, among those hospitalized, less requirement for ICU for those admitted compared with Delta /2 ft.com/content/d315be…
And the same, much less ICU need among those testing positive /3
People are asking why not 3rd shots for age <18, i.e. teens?
There is no application yet from a vaccine manufacturer to FDA for age <18, so it can't be recommended yet. That will change soon......
The US markedly lags many countries with boosters, in part because of poor messaging, and lack of priority to get *all* adults with fully restored vaccine effectiveness.
Would help vs Omicron, too. Boosters induce a striking increase in level & breadth of neutralizing antibodies.
Today's @washingtonpost editorial
"The [waning] phenomenon should compel all adults to get a booster shot."
This is only the 5th Variant of Concern since the pandemic began: Alpha, Beta, Gamma, Delta, and now Omicron.
That it was not named as a Variant of Interest is interesting and raises concern ;-)
There have been thousands of uninteresting #SARSCoV2 variants