The Medicines and Health Products Regulatory Agency (MHRA) said Thursday it had not received any reports of such clotting events after using the vaccine made by BioNTech and Pfizer.
Health officials said they still believe the vaccine’s benefits in preventing Covid far outweigh any possible risk of blood clots.
And, with around 3,000 blood clots occurring in the UK each month on average, it is not clear whether cases in people who have received the AstraZeneca vaccine are related to the vaccine.
The agency said in a report: “The benefits of COVID-19 vaccines continue to outweigh any risks and you should continue to get the vaccine when prompted. ”
The UK government has maintained that the Oxford / AstraZeneca jab is safe and has saved thousands of lives.
Some countries are limiting the use of the AstraZeneca vaccine while others have resumed inoculations, as reports of rare and sometimes serious blood clots continue to be investigated.
On March 18, the UK medicines regulator said there had been five cases of rare cerebral blood clots among 11 million injections given.
On Thursday, he put the tally at 22 reports of cerebral venous sinus thrombosis, an extremely rare brain coagulation disease.
There have been eight other reports of other clotting events associated with low blood platelets.
The cases were from a total of 18.1 million doses administered, or one blood clot event per 600,000 doses administered.
An agency report on the side effects of the vaccine, as well as the Pfizer vaccine, said they were generally neither serious nor lasting.
It read: “For the two vaccines, the vast majority of reports concern reactions at the injection site (painful arm for example) and generalized symptoms such as flu-like illnesses, headaches, chills, etc. fatigue (tiredness), nausea (feeling sick), fever, dizziness, weakness, muscle pain and rapid heartbeat.
“Usually these occur soon after vaccination and are not associated with more serious or lasting illness. ”
Earlier, the head of the Oxford University vaccination group, Professor Andrew Pollard, said that while “safety is clearly absolutely paramount” around 3,000 cases of blood clots occur each month in the UK for d ‘other causes.
Recently, the World Health Organization has sought to reassure people and governments that the vaccine is safe to use and is a key part of the pandemic response.
A spokesperson for the organization said “no cause and effect relationship has been established between the gunshot and the reported health issues.”
A series of European countries have suspended the AstraZeneca vaccine, with Germany this week stopping its use in people over 60.
A UK government spokesperson, speaking earlier in the week, said: “The Oxford / AstraZeneca vaccine is safe, effective and has already saved thousands of lives in this country. get the jab.
“More than 30 million people have already received their first dose of the vaccine, and we are on track to deliver injections to everyone over 50 by April 15 and to all adults by the end. July”.
In the UK, 31,147,444 people received a first dose of a Covid vaccine, while 4,513,458 received their second dose.