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Should COVID-19 vaccine boosters be delayed? Could the dose levels be reduced, and would mixing and matching shots from different makers work just as well?
These are questions now facing governments around the world as vaccine rollout falters and the coronavirus continues to rage, spurred on by new variants that are believed to be more contagious.
British health officials set the pace, announcing they will stretch out the second dose of vaccines authorised for use there up to three months, well beyond the three or four weeks recommended.
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The idea is to scale up the number of people who can be reached quickly, even if the level of individual protection falls short of what is reached with the booster.
Logistical problems in clinics across the country have put the campaign to vaccinate the United States against COVID-19 far behind schedule in its third week, raising fears about how quickly the country will be able to tame the epidemic.
Vaccine purgatory: Why nations must plan vaccination of their people – The Manila Times manilatimes.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from manilatimes.net Daily Mail and Mail on Sunday newspapers.