British Prime Minister Boris Johnson said Friday that the variant of the novel coronavirus first detected in England — and spreading around the world, including in the United States — "may be associated with a higher degree of mortality."
The new strain was already known to be more infectious than the original virus. Studies have suggested it is 30 to 70 percent more transmissible.
At a news briefing Friday at 10 Downing Street, Johnson and his advisers gave the first indication that the strain also might be more deadly.
England’s chief scientific adviser, Patrick Vallance, offered an example. He said that among 1,000 men in England age 60 or older who get infected, the original virus would kill 10. The new variant, he said, would kill 13 or 14. That would represent a 30 percent rise in mortality, though it is important to note that absolute risk of death remains low.
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是病毒變種到疫苗無用定疫苗追不上變種
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