The US Food and Drug Administration has amended the emergency approvals for three Covid-19 vaccine booster shots to make them available to more people. At the same time, the agency said a booster shot from any of the approved vaccines may be administered to people whose first vaccination was with a different product.
“A single booster dose of any of the available Covid-19 vaccines may be administered as a heterologous booster dose following completion of primary vaccination with a different available Covid-19 vaccine,” the agency said on 20 October.