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elizabeth lays it out well what moderna is asking. i find moderna an interesting case here as they are asking about a half dose for people 65 and older, younger adults with underlying conditions, or people at high risk of exposure. the pfizer booster already authorized. how do you see moderna being different here than pfizer if at all? yeah, i mean, there are few differences. first of all, with the pfizer/biontech vaccine you started to see declines in vaccine effectiveness. it went down over 90% down to 40% to 50%. that was a trigger for the need for a booster. that s how the immune system works. we give a series of rapid immunizationings for kids and it goes up and down and as it declines, a booster becomes more effective. for the moderna vaccine, we re not seeing the same decline in immune response yet for from the first two doses, so there s a

Elizabeth cohenBiontech vaccineImmune system worksVaccine effectivenessRapid immunizationingsModerna vaccine