US President Joe Biden has received a Covid-19 vaccine booster inoculation, hoping to provide a powerful example for Americans on the need to get the extra shot even as millions go without their first.
In getting the booster, Mr Biden dismissed criticism that the United States should distribute more vaccines worldwide before allowing boosters at home. "We are going to do our part," he said.
The US Centers for Disease Control and Prevention (CDC) last week backed an additional dose of the Pfizer Inc /BioNTech vaccine for Americans aged 65 and older, adults with underlying medical conditions and adults in high-risk working and institutional settings.