OMICRON, a new SARS-CoV-2 variant of concern, has rapidly overtaken all other variants in the new waves of Covid-19 cases that are emerging in South Africa, the UK, the European Union and the US. More worrying is that Omicron is able to infect those who have received two vaccine doses or already had Covid earlier. This is supported by laboratory evidence though they are still very preliminary results. The good news, if it can be called good news, is that most of those who have been vaccinated do not seem to progress to a critical stage.