The evidence is very strong that both company's Covid vaccines are very effective at preventing symptomatic COVID infections 12 days after the first dose.
It's very likely that 12 days after getting their first COVID vaccine dose - Pfizer or Moderna - will be well-protected against getting ill from the virus.
Dr. Walsh, one of the leaders of the local trial of the Pfizer vaccine, says the information, while encouraging, is also sparking debate "as to how to optimally benefit in the face of a severely escalating pandemic."
Great Britain is rolling the dice, stretching out time between vaccine doses up to 12 weeks so more people will get at least one dose more quickly.
He says it's also possible that smaller doses might be effective in preventing infections and getting more people vaccinated.
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