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and making them hesitant. i thinkty predicted last week there will be many surges in different parts of the country because of low vaccination rates and delta variant. >> would you recommend that americans start masking up indoors once again even if they are fully vaccinated? >> we know that the vaccines protect people from serious illness and death and do that at about 95% effectiveness. what we are less clear about are asymptomatic and mild cases of the covid. i do think if you are going to go inside -- we have some conflicting data from israel, from britain, it is not clear how much transmission happens with the vaccine with the delta