Bulgaria, Denmark and Norway are among the countries that have paused its use.
But on Friday a WHO spokeswoman said there was no link between the jab and an increased risk of developing a clot.
Margaret Harris said it was an “excellent vaccine” and should continue to be used.
Around 5 million Europeans have already received the AstraZeneca jab.
There have been about 30 cases in Europe of “thromboembolic events” – or developing blood clots – after the vaccine was administered. There were also reports that a 50-year-old man had died in Italy after developing deep vein thrombosis (DVT).
The WHO is investigating the reports, as it does any safety questions, Ms Harris said.
But no causal relationship had been established between the shot and the health problems reported, she said.
On Friday, AstraZeneca said the recorded number of blood clots in vaccinated people was “significantly lower… than would be expected among the general population”.
“An analysis of our safety data of more than 10 million records has shown no evidence of an increased risk of pulmonary embolism or deep vein thrombosis,” a spokesperson said.
Bulgaria’s decision to pause its rollout followed similar steps by Denmark, Iceland and Norway as well as Thailand. Italy and Austria have stopped using certain batches of the drug as a precautionary measure.
The European Medicines Agency, the EU’s medicines regulator, said earlier there was no indication the jab was causing the blood clots.
Other countries, including the UK, Germany, Australia and Mexico, have said they are continuing their rollout.
Germany’s Health Minister Jens Spahn said he disagreed with the countries suspending the vaccinations.
“From what we know so far, the benefit… is far greater than the risk,” he said.
The temporary suspensions come as a setback for a European vaccination campaign that has stuttered into life, partly due to delays in delivery of the doses.
In the latest upset, Austrian Chancellor Sebastian Kurz complained that the EU was not distributing coronavirus vaccines fairly among member states – according to population size, as agreed.
He said some countries were striking side deals with vaccine makers instead of leaving procurement to the European Commission.
The German health ministry acknowledged in January that Germany had signed a deal for 30 million doses with Pfizer BioNTech in September.
Also on Friday, the WHO approved Johnson & Johnson’s single-shot vaccine. It followed EU approval which was given on Thursday, while regulators in the United States, Canada and South Africa have also backed the drug.
What’s the situation in Europe?
After cases declined in recent months, several European countries are now seeing a resurgence of the virus. France, Italy, Poland and Turkey have seen the highest numbers in recent weeks.
The whole of Italy is braced to enter the country’s strictest lockdown measures over the Easter weekend, 3 to 5 April.
Under rules set to be confirmed by the government, residents will only be allowed to leave home for work, health reasons, essential shopping or emergencies. All non-essential shops will be closed as will bars and restaurants. School lessons must be held online.
The total number of deaths in Italy rose to 100,000 on Monday – the highest toll in Europe after the UK. Officials say infection rates are rising as new variants of the virus take hold.
Source: BBC
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