Companies that do business with the federal government must mandate Covid-19 vaccines for their workforces and ensure compliance with masking and physical distancing requirements, under new White House guidance released Friday.

The presidents of New York City’s teachers and principals unions urged Mayor Bill de Blasio to push back his Tuesday deadline for staff to be vaccinated against Covid-19, warning it will result in employee shortages that will imperil the safety of children.

It was up to Centers for Disease Control and Prevention director Rochelle Walensky to sort out a crucial question: which Americans should be the first to get Covid-19 booster shots.

Flight attendants accusing American Airlines Inc. of age discrimination in two voluntary buy-out programs during the Covid-19 pandemic suffered a setback when a federal judge in California dismissed their claims and expressed some willingness to transfer the case to Texas.

Regulatory clearance of a Pfizer Covid-19 booster for some U.S. populations falls short of the Biden administration’s goal to get most immunized Americans an extra jab, but it still amplifies calls for sending more shots to poorer nations.

President Joe Biden said 60 million Americans who got the Pfizer Inc.-BioNTech SE Covid-19 vaccine will soon be able to get a booster shot, after one of his top health officials overruled an advisory panel to expand eligibility.