Detroit Police Chief James Craig tested positive for coronavirus Friday morning, Detroit Mayor Mike Duggan announced in a news conference that also touched on the launch of drive-thru testing for the virus.

Assistant Chief James White is taking over day-to-day operations while Craig recovers and continues to work remotely. Craig has mild symptoms and has not been hospitalized, Duggan said Friday.

Thirty-nine police officers have tested positive for the virus so far and 468 are in quarantine. Two members of the department have died of the virus.

The city has ramped up prevention efforts for its police force, including using symptom screening forms and temperature checks for employees.

"It's not just Detroit. In the New York police department they have well over 300 officers who have tested positive for COVID-19 and three of their highest police officials have also tested positive," Duggan said. "This is the world we live in now ... What we have learned in the last month across this country is that when it comes to police departments, we have to put just as much focus on preventing officers from infecting each other" as being infected by residents.

The mayor also spoke at the news conference about mass drive-thru testing for the coronavirus, which started at 1 p.m. Friday at the former Michigan State Fairgrounds in Detroit. He said it has gone "so well" that testing will ramp up more quickly than expected.