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How can countries stretch COVID vaccine supplies? Scientists are divided over dosing strategies –

Researchers worry that efforts to free up limited vaccine doses are driven by desperation rather than data.



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A man in London is given the PfizerBioNTech COVID-19 vaccine.Credit: Leon Neal/Getty
Amid skyrocketing coronavirus infections, some countries are attempting to stretch limited supplies of COVID-19 vaccines by reducing doses or changing vaccination schedules from those shown to be effective in clinical trials. But data are scarce on the impact of such measures, and scientists are split over whether they are worth the risks.
It might be fine, says virologist Dan Barouch at Harvard Medical School in…

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