Co-author of paper claiming COVID-19 vaccines linked to miscarriage says he’s retracting it – Retraction Watch retractionwatch.com/2021/11/16/co-…
This paper was really embarrassingly ignorant — they purported 91% miscarriage rate from reanalysis of NEJM suggesting miscarriage rate was not high after vaccination.

They take subset of first trimester “completed pregnancies” and noted nearly all ended in miscarriage …
But ignored the fact that given the timing of the study there was no way for the women vaccinated in first trimester to have delivered a full term baby yet, so of course the “completed pregnancies” were the miscarriages.
They ignored the many women vaccinated in first trimesters whose pregnancies were fine and they would later go on to deliver a healthy newborn.

When considering this censoring there were no excess miscarriages evident.
I pointed out this error of logic in my blog post in July when there was lots of buzz from claims that vaccines were causing miscarriages

covid-datascience.com/post/nejm-pape…
This specious argument of vaccines causing miscarriages based on this misunderstanding was broadly promoted by many anti vaccine activists, including Steve Kirsch @stkirsch @VaccineTruth2 as I pointed out in my critique of his DarkHorse podcast in July

covid-datascience.com/post/are-the-m…
Here is the link to the erroneous paper being retracted:

…d-4d71-89ff-9fe2d3ad957f.filesusr.com/ugd/adf864_2bd…

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Prof Jeffrey S Morris

Prof Jeffrey S Morris Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @jsm2334

17 Nov
@surfernan put up the most recent episode of her VAX Files @thevaxfiles, this one dealing with boosters and mandates.

I contributed to the discussion on mandates, discussing evidence for immune protection from previous infection & implication on mandates

podcasts.apple.com/us/podcast/14-…
Besides me, the other experts interviewed included
Dr. Monica Gahdni @MonicaGandhi9
Dr. Nikolai Petrovsky @vaxine_news
Dr. Nadia Sam-Agudu @NASAdoc
Dr. Miguel O'Ryan @MiguelORyan1
Dr. Andrew Reed
This podcast is exceptionally well put together with tremendous professionalism and polish, providing a clear, balanced, and insightful discussion of boosters and mandates.
Read 10 tweets
9 Nov
Just peeked at Israeli MOH 11/9 data on current infection/serious infection rates split out by unvaccinated, boosted, & vax/not boosted.

We see boosted strongly protected vs. infection, and vaccinated/boosted show evidence of waning effectiveness, but still 50-70% VE_infection
For serious disease, again boosted are strongly protected. But even vaccinated/not boosted have much lower severe disease rates than unvaccinated.
Remember, these are CURRENTLY active cases, so only a snapshot, but show (1) strong protection of boosters and (2) Even unboosted vaccinated subpopulation seem to have substantial protection vs. severe disease, at all age groups.
Read 9 tweets
7 Oct
What do currently active cases on Israeli MoH dashboard say about vaccine effectiveness vs. infection/severe disease for those vaccinated and with/without booster?

Here are the current data as of October 7, 2021 after roughly 2 months of delivery of boosters:
These data come from the Israel MoH dashboard from October 7, 2021 (datadashboard.health.gov.il/COVID-19/gener…) and include counts of currently active infections and severe infections by age group, split out by vaccination status (unvaccinated, boosters, or vaccinated but no boosters).
I simply computed "vaccine effectiveness" for vaccine (or booster) as the 1 minus the ratio of the infection (or serious infection) rate for the vaccinated (or boosted) group and the unvaccinated group.

Note that this is only a snapshot of current cases.
Read 10 tweets
5 Oct
Lancet paper based on >3.4m USA patients found Pfizer vaccine effectiveness (VE) vs. infection decreased from 88% 1m after vaccination to 47% after 5m, but that VE vs. hospitalization remained strong at 93% through 6m.

This 🧵 will summarize key results.

thelancet.com/action/showPdf…
This paper followed >3.4m patients >12yr old in the Kaiser Permanente Southern California (KPSC) system between 12/20 and 7/21 using a retrospective cohort design.

All patients needed to have >1yr of previous data to establish comorbidities.
Their primary analysis computed relative risk of PCR+ infection, comparing unvaccinated with fully vaccinated individuals for each calendar day.

They adjusted for age, sex, race, previous SARS-CoV-2 infection, SES, previous health-care utilization, & various co-morbidities.
Read 9 tweets
3 Oct
Large contact tracing study in UK shows Pfizer vaccine reduces transmission by 82% vs alpha and 65% vs delta and AstraZeneca by 63% and 36%, respectively. medrxiv.org/content/10.110…
The study uses the national contacting tracing registry and compares testing positivity of contacts across vaccinated and unvaccinated, stratify information by vaccine type and number of doses
The modeling accounts for key potential confounding variables in the tested individual so as not to be driven by demographic factors.
Read 6 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Thank you for your support!

Follow Us on Twitter!

:(