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years before we need a booster? i do. i mean, if you look at the studies looking at people who are naturally infected or people who have been vaccinated and look at frequency of so-called memory cells, memory b cells which make antibodies or memory t cells, it looks like the frequencies are pretty high. there s a study out of atlanta to suggest that you would imagine immunity would last for a few years. i d really be surprised if we needed a yearly vaccine. as long as we re trying to prevent severe critical disease. if we re trying to prevent mild disease, then you would need a more frequent booster but i don t think that s the goal here. let s talk about this mrna technology, which is the center of the pfizer vaccine, the moderna vaccine. there s good news that potentially they could help in advancing process on an hiv vaccine, also for respiratory illnesses as well, backing into

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