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Three, four or more: what’s the magic number for booster shots?

COVID vaccine boosters are proving a useful tool against Omicron, but scientists say that endless boosting might not be a practical or sustainable strategy.
  1. Clare Watson

    1. Clare Watson is a freelance writer in Wollongong, Australia.

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Late last year, studies showed that third shots (boosters) of COVID vaccines were effective at providing a little extra protection from infection — particularly in the face of the Omicron variant. Some countries are now offering fourth doses, but scientists say that endless boosting might not be a viable strategy, nor is it how these vaccines were meant to be used.

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Nature 602, 17-18 (2022)

doi: https://doi.org/10.1038/d41586-022-00200-9

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