The side effects of a third Covid-19 shot, whether vaccine mandates are driving away health care workers, and more.

Just how effective is mask-wearing? Here's what 3 new studies found. (Monday, Sept. 27)

Three new studies—including a randomized controlled trial—provide new evidence that masks can help prevent the spread of Covid-19. But the type of mask you use can make a big difference in the amount of protection provided.

Are vaccine mandates actually driving out health care workers? Here's what CEOs say. (Tuesday, Sept. 28)

Staff shortages are hitting providers across the country, especially in New York, where hospitals and nursing homes fear losing staff to the state's vaccine mandate for health care workers. But many hospital CEOs stand by vaccine mandates, saying it's their ethical duty to protect their patients and workers—and some leaders suggest concerns of losing staff due to the policies may be exaggerated.

What are the side effects of a third Covid-19 shot? Here's what CDC found. (Wednesday, Sept. 29)

The side effects experienced by people who received a third dose of either the Pfizer-BioNTech or Moderna Covid-19 vaccine were typically mild, according to a study released Tuesday by CDC. Here's how they compare to the side effects experienced after the initial, two-dose regimen.

Charted: Who's vaccinated (and who still isn't) (Thursday, Sept. 30)

The racial disparities in Covid-19 vaccination rates are narrowing, a new Kaiser Family Foundation poll shows—but sharp splits remain in vaccination across political parties, urban and rural areas, age groups, income levels, and more. Explore the poll's findings on our interactive chart.

Are vaccine mandates driving employees to quit? Here's what 16 health systems are experiencing. (Friday, Oct. 1)

When health systems began mandating Covid-19 vaccines, some worried the requirements would spur a mass exodus of employees—but how are those concerns playing out in practice? Here's what more than a dozen hospitals and health systems have seen so far.