Unclear if vaccines need tweaking for Omicron - EMA

European Medicines Agency's (EMA) executive director Emer Cooke said the agency needs more data on vaccine efficiency, the variant's transmissibility and the severity of disease it causes.

An official at the EU agency warned however against "a drop in the ability of the vaccine to exert due neutralisation for omicron."

Asked to comment about a study released earlier on Tuesday suggesting some women had heavier periods after being inoculated, the EMA said it had not established a link between changes in menstrual cycles and COVID-19 vaccines.

Our goal is to create a safe and engaging place for users to connect over interests and passions. In order to improve our community experience, we are temporarily suspending article commenting