The common names of the variants has been changed. The Public Health (WHO, CDC, etc.) now use Greek nomenclature thus variant B.1.612.2 is now Delta. The 4 variants in the photo are very concerning for these reasons:
- Increase in transmissibility or change in how fast it spreads
- Increase in virulence (death and hospitalization) or change in clinical disease presentation (stroke, pneumonia, heart failure, etc)
- Decrease in effectiveness of public health and social measures or available diagnostics, vaccines, therapeutics.