Australia's Deputy Chief Medical Officer says it is "likely" there is a link between the AstraZeneca vaccine and a Melbourne man being hospitalised with blood clots.
Concern over the AstraZeneca vaccine has already prompted some countries including Canada, France, Germany and the Netherlands to restrict its use to older people.
The World Health Organisation has also urged countries to continue using the jab.
"There should be no doubt whatsoever about the safety of vaccines".
In total, MHRA said it had identified 30 cases of rare blood clot events out of 18.1 million AstraZeneca doses administered up to and including March 25.
The UK's Medicines and Healthcare products Regulatory Agency, or MHRA, said in a statement that "Out of the 30 reports up to and including 24 March, sadly 7 have died".
The MHRA said on Thursday there had been "22 reports of cerebral venous sinus thrombosis (CVST) and 8 reports of other thrombosis events with low platelets".
Amid growing reports of rare blood clots possibly linked to the AstraZeneca shot, the U.K.'s health regulator said the benefits of the shot continue to outweigh the risks. And even if they are, British and European regulators have said they were so rare that the vaccine should continue to be used.
The European Medicines Agency said again Wednesday that it believed the vaccine was safe and that experts had not found any specific risk factors such as age, gender or medical history.
The health ministry estimates that 2.6 million doses of vaccine have now been administered since the campaign started in January. This is only 12% of the adult population. Germany took a similar decision earlier in the week.
The Netherlands stopped vaccinations with AstraZeneca for people under the age of 60 after five new cases of thrombosis among women.
The decision to suspend use of the vaccine is a further blow to the Dutch vaccination campaign which is running behind schedule. Benefits of vaccination against Covid-19 continue to outweigh any risks.
Ursula von der Leyen, the president of the European Commission (EC) has blamed pharmaceutical firms - primarily AstraZeneca - for not delivering the promised doses to the continent.
Britain's Prime Minister Boris Johnson gestures after receiving the first dose of AstraZeneca vaccine administered by nurse and Clinical Pod Lead, Lily Harrington at St.Thomas' Hospital in London, England.
She added: "It doesn't look from the behavioural response, the surveys I've seen, that it's affecting uptake in the United Kingdom and that's really important".
She added that all studies indicated the vaccine was safe and effective, while the fact different nations were reviewing their position was a sign that the "system was working".