The World Health Organization (WHO) today referred to the need for a boosting dose of coronavirus vaccines, noting that this is not yet clear and that more data needs to be collected.
"We do not know if boosting doses will be needed to maintain protection against COVID-19 "Until further data is collected, however, the matter is being investigated by investigators," the WHO said in response to a question from Reuters.
"There is limited data available on how long protection against current doses lasts and on whether a booster third dose would be beneficial and for whom," he added.
Pfizer Inc. plans to ask U.S. regulators to approve a third dose of its coronavirus vaccine within the next month, based on data on a higher risk of re-infection six months after vaccination and the spread of the highly contagious mutation. Delta.