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>> in general, it's much better to persuade people so that it's done willingly. because obviously you don't want to be mandating things that people don't want, or reducing the workforce by excluding people who don't want to be vaccinated. however, there is an ethical element, a sort of moral imperative, that if the disease is being spread by those who are caring for the sick or the elderly in care homes, you have to ask the question, isn't it better to protect the vulnerable and to do that through vaccinations? the best way is to use persuasion, discussion, and to work through communities. and that's the approach that's been taken in the uk, where we're quite averse to mandating, but also recognize the need to increase the rates in certain parts of the community. >> because of the super-transmissible delta variant, we're seeing some experts in the u.s. encouraging people to wear masks under some circumstances even if they've been vaccinated. do you think that's a good idea?