Was AstraZeneca vaccine finally exposed for causing TTS?!

Was the truth about the AstraZeneca vaccine causing a side effect called TTS finally exposed?! Take a look at the viral claims, and find out what the facts really are!


Claim : AstraZeneca Vaccine Finally Exposed For Causing TTS!

Right after news broke that AstraZeneca admitted in court for the first time that its COVID-19 vaccine can cause a deadly side effect called TTS, some people immediately claimed or suggested that the truth about the mRNA or COVID-19 vaccines were finally exposed.

PeterSweden : BREAKING: AstraZeneca has now ADMITTED in court that their covid injection can cause a rare side effect.

The side effect is called TTS and causes blood clots and low blood platelet count. THE TRUTH IS FINALLY COMING OUT!

Recommended : AstraZeneca Vaccine Blood Clots : What To Look For?


Truth : AstraZeneca Vaccine Was Not Exposed For Causing TTS!

This is yet another example of misinformation created or promoted by anti-vaccine activists, and here are the reasons why…

Fact #1 : AstraZeneca Submitted Legal Document On TTS Risk

According to news reports, AstraZeneca submitted a legal document to the High Court in February 2024, in which it acknowledged that its COVID-19 vaccine “can, in very rare cases, cause TTS“.

TTS, which is short for Thrombosis with Thrombocytopenia Syndrome, is a rare condition in which the patient develops a dangerous combination of blood clots and low platelets. TTS was previously known as Vaccine-induced Immune Thrombotic Thrombocytopenia (VITT).

In a very small number of cases, the AstraZeneca COVID-19 vaccine can trigger the immune system to create anti-PF4 (Anti-Platelet Factor 4) antibodies. These anti-PF4 antibodies attack the platelets, causing them to clump together and blood clots to form.

These blood clots are a little unusual in that they can develop in the large veins of the brain and/or abdomen and/or lungs, and are coupled with low platelet counts, leading to bleeding tendencies. However, the number of cases is very rare.

Fact #2 : AstraZeneca Denies Any U-Turn

AstraZeneca denies that its new submission was a U-turn on acknowledging that its COVID-19 vaccine causes TTS.

Its new submission also states that what triggers some people to suffer TTS after receiving the AstraZeneca vaccine is “unknown”, and TTS can occur in people independent of any vaccine. It also stated that “causation in any individual case will be a matter for expert evidence“.

Recommended : Does COVID Vaccinated Blood Clot In Just 3 Minutes?!

Fact #3 : AstraZeneca Vaccine TTS Risk Was Known Since 2021

Despite claims that “the truth is finally coming out“, it has been common knowledge since April 2021 – 3 years ago, that the AstraZeneca COVID-19 vaccine can potentially cause TTS in a small number of people.

On top of that, it was not keyboard warriors or anti-vaccine activists who started warning people about TTS. It was health officials who first identified cases of TTS / VITT as early as March 2021 – just two months after the AstraZeneca vaccine was first deployed.

By April, the evidence was clear enough that health officials started warning people about the risk of TTS / VITT, and restricting the AstraZeneca vaccine to people over 30. They only offered the vaccine to people over 40 in May 2021.

On 23 May 2021, Australian and New Zealand health officials also issued a joint statement on the risk of TTS from the AstraZeneca COVID-19 vaccine, pointing out that TTS is “rare”, and can be “treated very effectively”.

Fact #4 : AstraZeneca Vaccine TTS Risk Was Very Low

Even though health officials were aware of the TTS risk by April-May 2021, they continued to offer the AstraZeneca COVID-19 vaccine because the risk was judged to be extremely low – about one in 30 million.

Far fewer people – maybe one in 600,000, would die from TTS. In the United Kingdom, about 81 people died from blood clot complications linked to the AstraZeneca COVID-19 vaccine, after about 50 million doses were administered.

In August 2021, the Australian Academy of Sciences issued this infographic, in which it compared the risk of dying from TTS to other common risks.

Recommended : AstraZeneca Vaccine Blood Clot Risk : How Dangerous Is It?

Fact #5 : COVID-19 Blood Clot Risk Was Much Higher

What you may not know is that COVID-19 infections greatly increases the risk of developing blood clots – up to 41% in positive patients, and up to 95% in severe COVID-19 cases.

Blood clots can also develop (through different mechanisms) with smoking and the use of oral contraceptive pills (OCP). Back in May 2021, we created this table to better demonstrate the risk:

Risk Difference
Thrombocytopenia in
severe COVID-19 cases
Up to 95% 45,238X
in COVID-19 cases
Up to 41% 19,524X
Dying from COVID-19 Infection 0.25% to
119X to 4762X
Thrombosis from OCP
Up to 0.46% 219X
Thrombosis from Smoking 0.18% 85.7X
Thrombosis from OCP
Up to 0.01% 4.8X
Thrombotic Thrombocytopenia
(AstraZeneca Vaccine)
0.0021% Baseline

Fact #6 : AstraZeneca Vaccine Is Not mRNA Vaccine

Finally, let me just point out that the AstraZeneca vaccine for COVID-19 is not an mRNA vaccine, as claimed by some people.

The AstraZeneca COVID-19 vaccine, which is marketed as Vaxzevria and Covishield, is a viral vector vaccine based on the modified chimpanzee adenovirus, ChAdOx1.

So the rare TTS / VITT side effect of the AstraZeneca Vaxzevria vaccine has no bearing on the side effects of mRNA vaccines. They are based on completely different vaccine technologies.

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Dr. Adrian Wong has been writing about tech and science since 1997, even publishing a book with Prentice Hall called Breaking Through The BIOS Barrier (ISBN 978-0131455368) while in medical school.

He continues to devote countless hours every day writing about tech, medicine and science, in his pursuit of facts in a post-truth world.


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