What we know about the Delta variant
13 August 2021. The Delta variant of the novel coronavirus is now spreading rapidly around the world. The highly contagious variant, first identified in India in October, has been described by officials from WHO as “the fastest and fittest coronavirus strain”.https://covid-19.chinadaily.com.cn/a/202108/13/WS6115a0fda310efa1bd6687cf.html