they are very good when they are given sequentially but as a single test, they are not as sensitive. reporter: adding to the confusion? a statement from abbott the company that makes one of the authorized at-home tests binax now. binax now detected the virus in all tests an equivalent sensitivity as other variants and data from customers has not shown any change in test performance. still, the cdc isn t recommending any rapid tests as proof someone is covid free after isolation. we actually don t know how our rapid tests perform, and how well they predict whether you are transmissible during the end of disease. reporter: on the issue of masks, when and where should they be worn? paris, france, is mandating all people 11 and older in that city wear masks outdoors, as well as indoors. the decision was made after a record-breaking number of cases reported in a single day due, in particular, to the omicron variant the city police said.
masks, when and where should they be worn? paris, france, is mandating all people 11 and older in that city wear masks outdoors, as well as indoors. the decision was made after a record-breaking number of cases reported in a single day due, in particular, to the omicron variant the city police said. that hasn t happened yet on a large scale here in the u.s. but should it? why is paris masking outdoors, and not new york or miami? this was dr. anthony fauci in may. if you are vaccinated and you are outside, put aside your mask. you don t have to wear it. reporter: it isn t clear if that still holds true. and which masks really work? for sometime now, people in the u.s. have been wearing cloth masks but now experts say your best bet is a k n95 or n95 mask. that cloth masks are not as effective against the omicron variant. cloth masks are little more than facial decorations. there is no place for them in light of omicron.
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