Arizona Gov. Doug Ducey (R) listens as President Trump speaks during a tour of a Honeywell International plant that manufactures personal protective equipment in Phoenix on Tuesday. (Brendan Smialowski/AFP/Getty Images)

Arizona reversed course on Thursday and resumed a partnership with epidemiologists whose projections suggest the state may be moving too rapidly to reopen businesses as cases of the novel coronavirus mount.

The turnaround, after a public outcry, marked the latest chapter in a skirmish over data and public policy that reflects the anguished national debate over how to incorporate scientific expertise to protect both lives and livelihoods during a pandemic that has killed more than 75,000 Americans and thrown 33 million out of work.