As of September 20, 2023, the latest mutation of the COVID virus is BA.2.86.
It has been detected in a small number of samples from infected people and waste (sewer) water in several countries, including the United States, Denmark, Israel, South Africa, and the United Kingdom. BA.2.86 is a subvariant of Omicron and is more genetically different from the original Omicron variant than previous subvariants have been. It has over 35 amino acid changes compared with the more recently circulating XBB.1.5 variant. This number of genetic differences is roughly of the same magnitude as seen between the initial Omicron variant (BA.1) and previous variants, such as Delta (B.1.617.2). It is too early to say whether BA.2.86 is more transmissible or causes more severe disease than other Omicron variants. However, the fact that it has so many genetic changes is concerning to public health experts. They are closely monitoring the spread of BA.2.86 and its impact on the pandemic. These genetic changes are located throughout the vir...