The impact of coronavirus in the U.S. will get worse in the next days, according to U.S. Surgeon General Jerome Adams. 

“I want America to understand this week it’s going to get bad,” Adams told NBC’s Today Show on Monday.

He urged all citizens to follow recommendations to stay indoors to mitigate the spread of the pandemic, known as COVID-19.

“I think there are a lot of people that are doing the right things, I think unfortunately we’re finding out a lot of people think this can’t happen to them,” he said. “This week, it’s going to get bad.

Read more: COVID-19 crisis will get bad this week: US official