The higher risk of infection in counties in the U.S. that did not impose stay at home orders and enforce them is shown in this report in the NYT. Florida has counties in the list and the state only imposed a lockdown in the state as a whole on March 25. People in Jacksonville and Tampa continued to travel at a higher rate than people in other parts of the country says this report in NYT. In Louisiana not till March 20 weeks after after Mardi Gras celebrations in New Orleans was travel reduced significantly.
It takes 2-3 weeks of this higher travel to show up in data about infected people. Dr Fauci, the leading health expert on the crisis, says the impact of following the stay at home lockdown shows up in the reduced level of new cases in many areas, making this change in behaviour very critical.