DETROIT (AP) — Michigan’s worst-in-the-nation Covid-19 outbreak is starting to affect automotive production, with a major Ram pickup truck plant slowing its output due to a large number of absent workers. A person briefed on the matter says about 10% of the production work force at the Stellantis assembly plant in Sterling Heights, Michigan, either tested positive or is in quarantine. That’s about 600 workers, says the person who asked not to be identified because neither the company nor the United Auto Workers union is releasing details. Stellantis has brought in workers from other factories but the assembly line has slowed. Michigan continues to have the nation’s highest seven-day virus case rate, 538 per every 100,000 residents.