Covid variants change in severity, transmissibility, and immunity to vaccines produced to combat the virus

Any virus, including SARS-CoV-2 - the virus that causes Covid - can change over time, leading to thousands of different variants of Covid circulating across the world. 

While most have little to no impact on the properties of a virus, some changes can affect how easily it spreads.

Changes include the severity of the virus as well as the performance of vaccines, which in turn cause public health and social measures to fluctuate.... Read More: i24