Covid-19 pandemic: Pfizer seeks US regulator's nod for booster shot

FDA and EU regulator say no need for extra dosage at this time

Pfizer and partner BioNTech plan to ask US and European regulators within weeks to authorise a booster dose of its Covid-19 vaccine, based on evidence of greater risk of infection six months after inoculation and the spread of the highly contagious Delta variant.

The US Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) said, however, in a joint statement that Americans who have been fully vaccinated do not need a booster shot at this time.

The European Medicines Agency (EMA), too, said it was early to determine whether more than the two shots that are currently