ryan ribeiro. i asked him about a certain kind of face mask now being banned. he also discussed playgrounds re-opening and begin with the rising number of cases and hospitalizations. dr. ribeiro, arizona and texas just set new state records for covid-19 hospitalizations. what's your overall take on the rising number of cases and what people need to know regarding the precautions they should be taking? >> yeah, so i think the important thing to remember is when you see the publicly reported cases rising, there's a lag time to that because, you know, people don't really seek care. they don't seek testing until they've started having symptoms. and that means they might have been transmitting the virus to others for three, four, five days or even more. when recorded cases are rising the actual cases are probably actually ballooning much more than that. so i think what that means for the general population is the risk might be higher than it appears. >> we're hearing more places are banning those popular masks that have valves. are they less effective than regular m

ryan ribeiro about what we need to know. dr.ro, the world health organization, as you know, is now walking back its confusing comments on asymptomatic people spreading the coronavirus only in very rare situations. officials now saying much is still unknown about the virus. what is the bottom line here? >> scientists often distinguish between asymptomatic and presymptomatic covid patients. true asymptomatic cases where you never have symptoms is relatively uncommon, but most patients go through that, mild or undetectable. they were talking about very early data from contact tracing studies way may not be well suited to identifying asymptomatic spread and clarified that today and said this is not really saying much of anything about the general population, and i think that's true. unfortunately, we still need be to worried about asymptomatic spread and also especially about presymptomatic spread. >> 21 states and puerto rico are seeing a rise in coronavirus cases. most are in the south and west. is this the new normal, or is it a