Angelica LaVito

Researchers continue to puzzle over why the COVID vaccine developed by AstraZeneca and Oxford University appears to be more effective on a half dose. Wire photography: Lisa Maree Williams—Getty Images

For AstraZeneca’s COVID vaccine, less may be more—and that’s puzzling researchers

By Angelica LaVito, John Lauerman, and others

Walgreens has hired a new CEO.

Walgreens hires John Standley, former Rite Aid CEO, to run U.S. unit

By Bloomberg and Angelica LaVito

TOPSHOT-US-HEALTH-VIRUS-VACCINE-TRIALS

U.S. will conduct an unofficial dry run of a COVID-19 vaccine campaign this fall

By John Tozzi, Angelica LaVito, and others

A woman submits to a common coronavirus test, using a swab. Companies are inconsistent in their practice of testing employees for COVID-19.

The great workplace testing dilemma—Why some companies are screening employees for COVID-19, while others have opted out

By Emma Court, Christopher Palmeri, and others

Young people are getting sick from coronavirus.

Young people are getting extremely sick from coronavirus, according to new evidence

By Michelle Cortez, Angelica LaVito, and others

James Monsees-Juul

Juul co-founder James Monsees steps down as adviser, board member

By Angelica LaVito and Bloomberg

Altria writes down Juul stake by 1/3

Altria drastically distances itself from Juul after writedown

By Tiffany Kary, Angelica LaVito, and others