Delta variant (of SARS-CoV-2)
Refers specifically to the B.1.617.2 lineage of the COVID-19 virus. Used in news and medical contexts.
The Delta variant was reported to be more transmissible than earlier strains.
Vaccines still provide some protection against the Delta variant.
Variant using the Greek letter δ; less common but seen in technical contexts.
Compound of デルタ (Delta, from the Greek letter) and 株 (strain, stock). Named after the WHO classification system for SARS-CoV-2 variants.