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that's how something like this starts to spread. here's a very important number. 42. 42 days. that's two incubation periods. if you get to 42 days with no new cases, that's when people will say, okay, this outbreak is over. they've got to scour the entire country, surrounding areas, and make sure there are no new cases. and then it's time to pack it up. dr. sanjay gupta, cnn. >> very worrying situation. as sanjay said, 42 days. that's the number they're hoping to get to without any new cases. coming up, the united nations has just this hour released the world's leading report on how to curb climate change. >> how much will government's listen to this report? plus, the duke and duchess of cambridge have quite the pack packed itinerary today.