The first Covid-19 vaccines are "likely to be imperfect" and "might not work for everyone", the chairman of the UK Vaccine Taskforce has said.
Kate Bingham said no vaccine in the history of medicine "has been as eagerly anticipated" and that vaccination is "widely regarded as the only true exit strategy from the pandemic".
However, she cautioned against over-optimism and highlighted that a vaccine might not work for everyone, or for very long.
"We do not know that we will ever have a vaccine at all," she wrote in The Lancet. "It is important to guard against complacency and over-optimism.
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