The United States’ top infectious disease expert says the economy in parts of the country could be allowed to reopen as early as next month.

Dr. Anthony Fauci says there’s no light switch that will be clicked to turn everything back on. He says a “rolling re-entry” will be required based on the status of the new coronavirus pandemic in various parts of the country.

Fauci says those factors include the region of the country, the nature of the outbreak it already has experienced and the possible threat of an outbreak to come.

Social distancing guidelines imposed by President Donald Trump are set to expire April 30.

Trump is eager to restart the economy, which has stalled because most Americans are under orders to “stay at home” to help slow the virus’ spread.