places like israel that suggest after a period of six to eight months, the efficacy of the mrna vaccines, particularly the pfizer vaccine may start to wayne and that's unclear if it maybe lower levels of neutralizing antibodies or whether it's just that we have the prevalence of these more chance tran missble aggressive strains like delta. we always expected at some point we needed to boost and i expect we'll start doing that with the folks that are most vulnerable who are holder or immune compromised in someway. probably, eventually, everybody in this country will need a booster in the next several months. that doesn't surprise me. >> let me give the numbers from what you said because you said this follows what we're learning out of israel and the data suggesting the pfizer's vaccinefectiveness against the coronavirus has fallen and the numbers says 39% last month it was 64%.
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