 The head of drug maker Moderna has warned that COVID-19 vaccines are unlikely to be as effective against the Omicron variant of the coronavirus as they have been against the Delta variant. Stephen Bancel told the Financial Times that data will be available on the effectiveness of current vaccines in the next two weeks. On Monday, the World Health Organization warned that the global risk from the spread of Omicron was very high. The variant was first reported last week in South Africa.