Blood clotting with certain covid vaccines?

We have noticed that mainstream media talks a lot and about blood clots with astrazeneca covid vaccine but they do not give the reasons for the clots or where they form. This is unknown territory but some possible causes are known. The clots appear to affect younger people.

Here is the reason given by the New Scientist.

The blood clot syndrome involves an unusual type of clot, often one that forms in the brain – called cerebral venous sinus thrombosis or CVST – coupled with low levels of platelets, small particles in the blood that stick together to make clots.

What could be causing the clots?

In the Oxford/AstraZeneca cases, many of those affected have tested positive for antibodies that bind to a molecule released by platelets, called platelet factor 4 or PF4. The vaccine may somehow trigger production of these antibodies, which cause multiple small clots to form in the blood and that can use up platelets, says Andreas Greinacher at the University of Greifswald in Germany. It resembles a syndrome in which similar antibodies can be triggered by the blood-thinning treatment heparin, says Greinacher, who is an expert on the heparin side effect.

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To halt covid-19 in its tracks, we need vaccines that stop the virus spreading as well as preventing people becoming seriously ill. Until now it was unclear how effective the vaccines are at doing this, but with vaccine roll-outs well under way, we are starting to get some answers.

The good news is that mRNA vaccines like Pfizer/BioNTech appear to be around 90 per cent effective at blocking transmission.

The bad news is that as there are no plans to vaccinate children under 16 anytime soon, 

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