sharfstein: absolutely.t interpret what i am saying as criticism for the cdc telling individuals -- to me, this is a case of advice for individuals being over interpreted, overuse, may be rather than that there was a problem with the advice, so to say. jonathan: joshua sharfstein, johns hopkins bloomberg school of public health vice dean. i think this is where things get complicated for people. from the cdc, you just want science, and too often, there has been concerned whether science is being conflated with social issues, ethics, all of the above. lisa: there's also the legitimate concern for, say, the worker of a coffee shop who does not know if someone coming in is vaccinated or not vaccinated, and that person is not wearing a mask, and they do not feel safe. do they have legitimacy and the law behind them, the cdc recommendation, to say "please put on a mask"? jonathan: they do. companies get to set policy. lisa: yet those who are rewarded for taking looser guidelines may not be so good for public healt