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How effective is the first shot of the Pfizer or Moderna vaccine?

Two shots are better than one. While the Moderna and Pfizer mRNA vaccines weren’t designed specifically to ward off the delta variant of COVID-19, new research suggests a single dose provides less immunity against the coronavirus strains that are out there now than it did against the original strain. ... Read more»

Ask KHN-PolitiFact: How can COVID vaccines be safe when they were developed so fast?

The development of the first COVID vaccines may have seemed to occur at a dizzying pace. After all, scientists identified a new virus and created vaccines to protect against its most severe effects within a year. But the research underpinning these vaccines isn’t that new at all, vaccine experts say. Some of it is decades old. This foundation, combined with technical expertise, urgency and financial resources, enabled scientists to pull off the medical marvel.... Read more»

To extract more doses per vial, vaccinators put squeeze on FDA to relax vaccine handling advice

President Joe Biden has promised enough COVID vaccine to immunize every willing adult by June 1. But right now, the gap between supply and demand is so dramatic that vaccinators are discovering ways to suck the final drops out of each vaccine vial — if federal regulators will let them. ... Read more»