FILE PHOTO: A discarded face mask is seen lying on leaves in Northampton, Britain October 19, 2020. REUTERS/Andrew Boyers
GENEVA (Reuters) - Vaccines are a major part of the battle against COVID-19 but will not on their own end the pandemic, Mike Ryan, the WHO's top emergency expert, said on Friday.
"We are ... seeing data emerge that protection may not be lifelong and therefore re-infections may occur," Ryan said.
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