US expands Covid-19 booster eligibility to all adults

US regulators expanded eligibility for booster shots of Covid-19 vaccines to all adults on Friday, allowing millions more Americans to get additional protection against the virus amid a recent rise in infections.

The director of the Centers for Disease Control and Prevention (CDC), Rochelle Walensky, signed off on the expanded eligibility on Friday evening.

This is after the US Food and Drug Administration (FDA) broadened its...