(HRNW) AstraZeneca has said it is standing by its coronavirus vaccine after a US agency raised concerns about trial results that showed the shot to be highly effective in preventing Covid-19.
As immunization programs gather pace around the world, another vaccine ran into trouble on Wednesday when Hong Kong and Macau suspended the Pfizer-BioNTech jab over what authorities said were packaging problems.
The uncertainties are a blow to scientists’ hopes for a quick rollout of what they say is the best hope of ending a pandemic that has killed more than 2.7 million people.
AstraZeneca had published results from its US trials on Monday, showing the vaccine to be 79 percent effective in preventing Covid-19, but the US National Institute for Allergies and Infectious Diseases raised concerns that the results were outdated.
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