Fig. 1.
Worldwide incidence of the B.1.617.2 (Delta) variant as of 7th October 2021 courtesy of Outbreak.info. It has become the most widespread strain of SARS-CoV 2 after its initial detection in India in 2020 (Color figure online)
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.