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Kate O'Brien, the World Health Organization's director of immunization, vaccination, and biologics, has argued it may be too early for a push for population-level COVID-19 booster shots, especially when many people around the world have not even received their first dose.
O'Brien told Stat that the timing and rationale for third doses isn't really about "boosting," anyway. Instead, "it's actually about whether ... you need a third priming dose" for people who are immunocompromised. "For some vaccines ... there seems to be evidence coming forward, more about people who are having a failure of the primary series [of shots] and evidence on whether or not a third priming dose would help," she said.