by Jan HENNOP There is “no answer yet” on whether vaccine makers will have to adapt their Covid shots to counter the rapidly-spreading Omicron variant, Europe’s medicines watchdog chief said on Tuesday. The highly-mutated variant, now present in dozens of countries, appears to be more contagious than previous strains and is driving new waves of infections globally. Scientists are also examining whether it is more resistant to vaccines than previous strains. But the head of […]