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teter family say they're being selective in where they walk anaying off the narrower trails. >> we're limiting where we're going to paths like this that, you know, allow us to keep our distance. >> reporter: state park rangers will be out monitoring conditions at all the state parks and say if closing the parks to cars doesn't do enough to cut down on the number of people inside the parks, they could end up closing off more services like trails and the bathrooms. at mount diablo, knicks 5. >>> we are learning the u.s. has the most confirmed cases in the world. comments tonight from the world's leading expert on infectious diseases underscore how far we may be from the peak of the outbreak. >> generally, the reality is somewhere in the middle. looking at what we're seeing now, i would say between 100 and 200,000 cases. but i don't wanttobe to that because it's -- excuse me, deaths. i mean, we're going to have millions of cases. >> in light of dr. fauci's projection, today president trump said he would extend a nationwide social distancing 30 days to april 30th. his original 15 day guid