London — It is not yet clear whether the world needs a new set of vaccines to fight different variants of the novel coronavirus, but scientists are working on new ones so there is no reason for alarm, the head of the Oxford vaccine group said on Tuesday.

“There are definitely new questions about variants that we’re going to address, and one of those is: Do we need new vaccines?,” Andrew Pollard, chief investigator on the Oxford vaccine trial, told BBC radio...

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