Survivors of Covid-19 are significantly less likely than the rest of the population to catch the novel coronavirus—but their risk of reinfection is not zero, according to a study published Wednesday in JAMA Internal Medicine.

Amid recent drops in the United States' reported rate of new coronavirus cases, some states are rolling back restrictions aimed at curbing the virus's spread. But public health officials say it's too soon to loosen such measures, warning that the country may be on the verge of a fourth surge in the epidemic.

Researchers have long sought ways to predict whether a patient will develop Alzheimer's or Parkinson's disease, but their current options are costly and impractical. Now, they're exploring whether an inexpensive picture of a patient's eye could accurately assess risk, the Washington Post's Elizabeth Brown reports.

Providers in recent years have turned to vitamin C to treat sepsis, but a new, largest-of-its-kind study published in JAMA found vitamin C didn't improve patients' outcomes by a statistically significant margin, Richard Harris reports for NPR's "Shots." Even so, a prominent proponent of the therapy rejected the notion that "the matter is dead."

CMS says all private group health plans and issuers must cover the costs of diagnostic tests for the novel coronavirus regardless of whether a patient is experiencing Covid-19 symptoms or has been exposed to the virus, in today's bite-sized hospital and health industry news from Kentucky, Maryland, and Tennessee.