The U.K. medicines regulator on Wednesday concluded that adults under 30 should be offered an alternative to the Oxford/AstraZeneca COVID-19 vaccine, after reviewing cases of rare blood clots.

Jonathan Van-Tam, deputy chief medical officer for England described the move as “a course correction” for the U.K. vaccination program, meaning that younger adults will be offered alternative vaccines instead.

June Raine, chief executive of the Medicines and Healthcare Products Regulatory Agency (MHRA) said that the benefits continue to outweigh the risks “for the vast majority of people.” She said more work was needed to identify definitively if the vaccine is the cause of rare blood clots in younger adults.

“The balance of benefits and risks is very favorable for older people but it is more finely balanced for younger people,” she said.

Of over 20 million doses administered, there have been 79 reports of suspected blood clots with low platelets up to and including March 31. Nineteen people have died as a result, three of whom were under 30 years. Cases occurred in 51 women and 28 men aged between 18 and 79 years.

Raine said 14 of the 19 fatal cases were of cerebral venous sinus thrombosis (CVST), with low platelets, and five were other kinds of thrombosis in major veins.

Wei Shen Lim, chair of the Joint Committee on Vaccine and Immunisation, said that adults aged 18-29 years who do not have an underlying health condition that puts them at higher risk from serious disease should be offered an alternative COVID-19 vaccine in preference to the Oxford/AstraZeneca vaccine, “where such an alternative vaccine is available.”

To date, the U.K. has administered over 37 million COVID-19 vaccine doses including BioNTech/Pfizer and Oxford/AstraZeneca’s jabs (31.6 million first doses and nearly 5.5 million second shots). Around three in five of the jabs given are AstraZeneca’s.

As of April 6, a total of 126,882 people had died from coronavirus in the U.K.

The MHRA’s announcement came as the European Medicines Agency concluded its latest review into blood clots and the Oxford/AstraZeneca vaccine this afternoon. It did not restrict use of the vaccine, while noting there is a “possible link” to “very rare” cases of blood clotting.

Europe has given out around 40 million doses of the vaccine. Last week, the EMA said there had been 44 cases of blood clots in the brain in the European Economic Area as of March 22. The agency concluded then that the benefits of using the vaccine outweighed the risks.

In Europe, the vaccine has been restricted to older populations in France, Germany, the Netherlands, Sweden, Iceland, North Macedonia and Finland. Denmark and Norway have suspended its use completely. Elsewhere, it has been restricted to older people in Canada, while the U.S. has not yet approved the vaccine for use.



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