Europe's medicines regulator said on Friday it was reviewing reports of a rare nerve-degenerating disorder in people who have received AstraZeneca's Covid-19 vaccine, and requested more detailed data on the cases from the company.
As part of a regular review of safety reports for the vaccine, Vaxzevria, the European Medicines Agency's safety committee is analysing data provided on cases of Guillain-Barre syndrome, the regulator said.
The EMA is also looking into reports of heart inflammation with Pfizer-BioNTech's vaccine, called Comirnaty, and Moderna's shot, it said. Both the vaccines use new mRNA technology to build immunity against the coronavirus.
The EMA and other regulators are already reviewing the possibility of rare blood clotting conditions with Covid-19 vaccines, including AstraZeneca's.
Guillain-Barré Syndrome is a rare neurological condition in which the body's immune system attacks the protective coating on nerve fibres. Most cases follow a bacterial or viral infection, and develop over the course of days or weeks.
It is an extremely rare, known risk associated with respiratory and gut infections, as well as some vaccinations in the past.
AstraZeneca, Pfizer, BioNTech and Moderna did not immediately respond to a request for comment.
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