Table of Contents:
  • Contents: Status and efficiency of SARS-CoV-2 genetic surveillance in the USA
  • The identification of a "Californian" variant, Epsilon, following a surge in Covid-19 cases in California in early 2021
  • The genetic characteristics of the Epsilon variant and the phenotypic advantages they provide
  • The more recent identification of a separate variant from India, the Delta variant: key characteristics and their implications