An Abbott Laboratories machine that can process large numbers of coronavirus tests have run only a tiny fraction of the million it could have, said a top U.S. health official, as the machines have yet to get up to their full capacity.

The Centers for Disease Control and Prevention is changing its guidance for workers in critical industries, including food supply and health care, to say that the people exposed to the coronavirus should return to work if they don’t have symptoms of the illness.

President Donald Trump’s new chief of staff, Mark Meadows, has escalated tensions in the White House with a swift series of staff changes that have drawn complaints from some in the West Wing about his management style, according to people familiar with the matter.

Smoking may raise the risk of Covid-19 by elevating enzymes that allow the coronavirus to gain access into lung cells, according to a new study.

Starbucks Corp. said that a sharp slowdown from the coronavirus pandemic will worsen before getting better, with financial impact extending as far as September.

President Donald Trump’s top health advisers are developing medical criteria for safely reopening the U.S. economy in coming weeks should trends showing a crest in the coronavirus outbreak hold steady.