British regulators say they have identified 30 cases of rare blood clot events after the use of the AstraZeneca COVID-19 vaccine, 25 more than previously reported.
The Medicines and Healthcare products Regulatory Agency said on Thursday it had received no such reports of clotting events following use of the vaccine made by BioNTech SE and Pfizer.
The health officials said they still believe the benefits of the vaccine in the prevention of COVID-19 far outweigh any possible risk of blood clots.
Some countries are restricting use of the AstraZeneca vaccine while others have resumed inoculations, as investigations into reports of rare and sometimes severe, blood clots continue.
On March 18, the UK medicines regulator said there had been five cases of a rare brain blood clot among 11 million administered shots.
On Thursday, it put the count at 22 reports of cerebral venous sinus thrombosis, an extremely rare brain clotting ailment, and 8 of other clotting events associated with low blood platelets from a total of 18.1 million doses.
Glastonbury Festival will meanwhile join 2700 UK museums, theatres, cinemas and arts venues in receiving a share of 400 million pounds ($AU720 million) in grants and loans to help survive the pandemic.
Entertainment venues across Britain were forced to close last March and while some partially reopened, many have remained shut.
Last July, the government unveiled a 1.57 billion pound Culture Recovery Fund package of grants and loans, and has now detailed where the latest tranche will be spent.
Glastonbury, the largest greenfield music festival in the world and forced to cancel for two years running, will receive 900,000 pounds to help carry it through 2021.
Tens of millions of pounds have been made available to theatres, while the English Heritage Trust, which looks after 420 historic monuments, buildings and objects, will receive 23.4 million pounds.