SARS-CoV2 and currently there is no additional or public health concern regarding the Delta sub-lineages. In its latest bulletin dated 20 September, the INSACOG said that Delta continues to be the main variant of concern in the country. “The second wave, driven by the Delta (variant), is continuing at low levels in some Indian states and there is no evidence of a new variant," it added.
Hospitals were overwhelmed and health infrastructure was severely stressed during the second wave of coronavirus in the country between March to May.
There is a small but steady increase in AY.1 since June 2021, which is being monitored, the INSACOG noted. AY.4 is the most frequently seen Delta sub-lineage in recent sequences from India, as well as