THE HAGUE, Netherlands (AFP) — The use of so-called “mix and match” Covid-19 vaccine boosters may give a stronger immune response than sticking to one type of jab, the EU’s drug watchdog said on Thursday. The European Medicines Agency (EMA) said it was studying data to see if it will follow a decision by US authorities on Wednesday to allow the use of a different vaccine for follow-up shots. The Pfizer-BioNTech, Moderna, Johnson & Johnson […]