The measures taken have a delay until you notice their effect. Since we only see confirmed cases (delayed by the incubation period and probably mostly those who

The measures taken have a delay until you notice their effect. Since we only see confirmed cases (delayed by the incubation period and probably mostly those who show severe symptoms) and deaths (delayed further by the time it takes to die) there's a lot of people out there who don't (yet) show any symptoms but can still infect others. With the lockdown measures in places we should see an effect in reduced confirmed cases in the next few days, hopefully.