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vaccine and is stepping up to produce a booster dose. >> let's discuss the breaking news with the former obama white house health policy adviser. he's the adviser of which country has the world's best health care. there you see the cover of the book. thanks for joining us. we got this very disturbing breaking news. pfizer says its vaccine is losing efficacy. how troubling is this as the more dangerous delta variant takes a hold here in the united states? >> well, we have to know a little bit about more what it says is losing potency. there have been some conflicting reports that you're getting these centers in lymph nodes that are persistent. maybe they're following the antibody level which you might expect to go down while you do have memory cells. we have to know how long before they're seeing a decline in the