LONDON (AP) — The world is awaiting the results of an initial European investigation into whether there is any evidence that the AstraZeneca coronavirus vaccine was behind unusual blood clots reported in some recipients of the shot.
Concerns over the clotting led more than a dozen European countries to suspend vaccinations with the shot, even though the company and international health agencies said there was no indication the vaccine caused the clotting and recommended continuing inoculations. The European Union drug regulator’s expert committee is expected to give an explanation of its analysis later Thursday, including whether any new precautions should be taken regarding the vaccine.
While many countries have continued to use the vaccine, there are concerns the debate could cast doubt on the shot, which is key to efforts to vaccinate the world’s population, especially in poorer countries. Even in Europe, where countries have a choice of vaccines, it has complicated an already slow rollout at a time when infections are rising again in many countries.
The head of the European Medicines Agency said this week that the drug regulator’s priority was confirming the vaccine is safe and that it would consider a range of actions, including if extra warnings needed to be added to the AstraZeneca vaccine.
“We are worried that there may be an effect on the trust of the vaccines,” Executive Director Emer Cooke said. “But our job is to make sure that the products that we authorize are safe and we can be trusted by the European citizens.”
There have been reports of blood clots in 37 people among the 17 million who have received at least one dose of the AstraZeneca vaccine in Europe. Both the EMA and the World Health Organization have said there is no current evidence to suggest the vaccine was responsible and that the benefits of immunization far outweighed the potentially small risk. The drug maker said after a careful review of its COVID-19 immunization data, it found no evidence of any increased risk of blood clots in any age group or sex in any country.
The pause in vaccinations using the shot comes as Britain is expecting major delays in its vaccine deliveries and tens of thousands of new daily cases have prompted new lockdown measures in Italy, caused hospitalizations in France to spike and led German officials to announce that a third surge of COVID-19 has begun.
Figures from the European Centers for Disease Prevention and Control this week show there are about 7 million unused AstraZeneca vaccines across the 27-nation EU.
The German government defended its decision to suspend the use of the vaccine, saying it was based on expert advice.
Government spokeswoman Ulrike Demmer told reporters in Berlin on Wednesday that she understood some might be worried by the move, but it should be seen as a sign that “trust in our control mechanisms is justified.”
“That’s why this step could also strengthen trust” in the vaccines, she said. “Concerns are taken seriously and examined. And as soon as these concerns are cleared up, a vaccine can be used again without hesitation.”
But some experts have expressed concern that the opposite might happen: that the very public and dramatic suspensions could feed already high skepticism of vaccines that were developed in record time.
Germany will rely on the EMA decision for how to proceed, Health Ministry spokesman Hanno Kautz said. Other countries including France have also indicated they will follow the advice issued Thursday.
Any time vaccines are rolled out widely, scientists expect some serious health issues and deaths to be reported, simply because tens of millions of people are receiving the shots. Determining whether or not the vaccine is to blame can be difficult, especially since vaccination campaigns are currently focusing on vulnerable people who may have other health issues.
But because there are no long-term data on any of the COVID-19 vaccines, any potential signal of trouble must be thoroughly investigated.
Because clinical trials are only done in tens of thousands of people, extremely rare side effects often aren’t detected until vaccines are used in many millions of people, long after they have been licensed. For example, it took nearly a year after vaccination campaigns began following the 2009 swine flu pandemic for European officials to notice an increase of narcolepsy in children and teenagers who got the GlaxoSmithKline vaccine.
And in the Philippines, the government in 2017 was forced to stop its national dengue vaccination program with a new shot developed by Sanofi Pasteur after about a year, when more than 130 children who were immunized died. It turned out the vaccine worsened the effects of dengue in any children who hadn’t been previously infected.
“It’s right to investigate any potential signals of problems, but you can do that while you continue immunization,” said Michael Head, a senior research fellow in global health at the University of Southampton. “If we pause the vaccine rollout every time there’s a possible signal, it won’t be much of a rollout.”
Jordans reported from Berlin.
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