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It effective at preventing infection or serious illness from this varpt? that's why this is such an interchangeable new world when it comes to these vaccine developments. you know these are safe, then you can focus paidly on effectiveness with the substituing out. it is just a matter of getting people to enroll in the studies. >> why didn't they do that from delta? >> the belief was that two doses of the, have eep was still extremely effective against severe disease, even if effectiveness against infection or testing positive was slightly lower. so we were seeing real world evidence that they ...