By 3 July 2021, Delta became dominant in the US.
Retrieved 3 September 2021.
Doctors in Singapore have been using supplemental oxygen, and on more Delta patients than they did on previous variants.
Preliminary data from two studies indicate that the is effective against the Gamma variant, although the exact level of efficacy has not yet been released.
Retrieved 24 April 2022.
Lineages As of August 2021, Delta variants have been subdivided in the Pango lineage designation system into variants from AY.