WHO vaccine advisers say 2nd Pfizer Covid jab may be delayed

GENEVA: The WHO’s vaccine advisory group said Tuesday that the second Pfizer-BioNTech anti-Covid-19 vaccine dose could, in exceptional circumstances, be administered a few weeks beyond the recommended 21-28 days.
Some countries have begun delaying the second jab to give more people their first dose, despite German firm BioNTech warnings that there was no data backing the “safety and efficacy” of doing so.