Countries are scrambling to stop a new covid variant

IF THERE is one lesson the covid-19 pandemic has taught the world, it is that acting early pays off. Wait a week for better data on which to base a decision and you can find yourself down a path of no return, with cases rising steeply. So when news emerged on November 25th in South Africa of a worrying new variant of the SARS-CoV-2 virus, many countries in Europe and elsewhere banned travel from countries in southern Africa within a day. On November 26th the World Health Organisation named the variant Omicron, a Greek-alphabet designation which, as a rule, it reserves only for “variants of concern”.

The concerns with Omicron are indeed many. The biggest is that it may have the ability to spread more easily than Delta, the variant that dominates cases of covid around the world today. If so, Omicron could supplant Delta within months. In that case, Omicron would cause bigger outbreaks that flare up faster than Delta and are harder to stop. Another worry is that today’s vaccines and drugs against covid may be less potent against Omicron and may therefore need to be redesigned.