DETROIT, MI —Ford, General Motors, Fiat Chrysler, Honda, and Toyota said they would shut down all factories in the region, citing concerns for employees who work in close quarters building automobiles. Nissan will close U.S. factories. Hyundai shut down its Alabama plant after a worker tested positive for COVID-19.

Detroit's three automakers said their closures would begin this week, while Honda and Toyota will start next week. Nissan will close U.S. plants starting Friday. Closings will run from a few days to over two weeks, but most automakers said they'll have to evaluate the spread of the virus before reopening.

“We have been taking extraordinary precautions around the world to keep our plant environments safe, and recent developments in North America make it clear this is the right thing to do now,” GM CEO Mary Barra says.

Detroit's three automakers alone will idle about 150,000 workers. They likely will receive supplemental pay in addition to state unemployment benefits. The two checks combined will about equal what the workers normally make. GM said pay was still being negotiated with the United Auto Workers union.

Ford said it will work with union leaders in the coming weeks on plans to restart factories. The union has been pushing for factories to close because workers are fearful of coming into contact with the virus.

Honda announced plans Wednesday morning to close for a week starting Monday, putting additional pressure on Detroit's automakers to follow suit. Toyota plants will close Monday and Tuesday, reopening Wednesday after a thorough cleaning, the company said. Nissan's closures will last through April 6.

In addition, Hyundai suspended production at its plant in Montgomery, Alabama, plant Wednesday after a worker tested positive for the coronavirus. The company said production would resume once its health and safety team determines that the plant has been sufficiently sanitized.

The decision by Ford, General Motors and Fiat Chrysler reverses a deal worked out late Tuesday in which the three agreed to cancel some shifts so they could thoroughly cleanse equipment and buildings, but keep factories open. But workers, especially at some Fiat Chrysler factories, were still fearful and were pressuring the union to seek full closures.

Before the closings were announced, Fiat Chrysler sent workers home from a factory in Sterling Heights, Michigan, north of Detroit, after workers were concerned about the virus. The company said a plant worker tested positive for COVID-19 but had not been to work in over a week.

Ford said it closed an assembly plant in the Detroit suburb of Wayne, Michigan, on Wednesday after a worker there tested positive for the virus that causes COVID-19. The company said it is thoroughly cleaning and disinfecting the building. Production will be halted through March 30.

Automakers have resisted closing factories largely because they book revenue when vehicles are shipped from factories to dealerships. So without production, revenue dries up. Each company has other reasons to stay open as well. Ford, for instance, is building up F-150 pickup inventory because its plants will have to go out of service later this year to be retooled for an all-new model.