Omicron signs to spot in vaccinated as new study finds booster offers no added protection

OMICRON has undergone several mutations since it was first identified in South Africa last year. The Covid variant's inbuilt advantage over previous strains has sparked fears it may escape vaccine-induced immunity. Now a new study - yet to be peer reviewed - concludes a third booster dose of a Covid vaccine offers no added benefit against Omicron. What are the signs to spot in the fully vaccinated?