It's because 14 days incubation time. It will take 14 days until number start to pick up from the initial infection in new area. It also depends if there is a

It's because 14 days incubation time. It will take 14 days until number start to pick up from the initial infection in new area. It also depends if there is a space available hospital --- overflown hospitals (as in Wuhan) will make numbers grow much quicker.