The evolution of the Delta variants is now a concern if they can develop relevant resistance to the vaccine antibody response. Researchers are concerned about how far it has evolved structures and proteins to circumvent cell defenses set from exposure to previous strains.
The emergence of new SARS-CoV-2 variants that can spread rapidly and undermine vaccine-induced immunity threatens the end of the COVID-19 pandemic. The delta variant (B.1.617.2) emerged in India and subsequently spread globally within a short time period. Also in Germany, almost all recent infections are due to this variant.