Understanding COVID-19 Variants

COVID-19 is caused by the SARS-CoV-2 virus. Like all viruses, SARS-CoV-2 changes over time through mutations. Sometimes, new versions of the virus, called variants, emerge. These variants can have different characteristics, such as how easily they spread or how severe the illness they cause might be.

Identifying the Indian COVID-19 Variant

The question asks for the official name of the Indian variant of the COVID-19 virus discovered in October 2020. Several significant variants of SARS-CoV-2 have been identified globally since the pandemic began. Scientists track these variants to understand their potential impact on public health.

Major COVID-19 Variants and Their Designations

Different naming systems have been used for variants. Early on, variants were often referred to by the country where they were first extensively reported. Later, the World Health Organization (WHO) introduced simple labels using Greek letters (Alpha, Beta, Gamma, Delta, etc.) to make discussion easier and avoid geographic stigma.

Let's look at some of the variants mentioned in the options:

• Alpha Variant: Originally identified in the UK (lineage B.1.1.7).
• Beta Variant: Originally identified in South Africa (lineage B.1.351).
• Gamma Variant: Originally identified in Brazil (lineage P.1).
• Delta Variant: Originally identified in India (lineage B.1.617). The B.1.617 lineage was first reported in India and its emergence and spread became particularly significant around late 2020 and early 2021. The Delta variant (B.1.617.2) was a major sub-lineage.

The Delta Variant: The Indian Connection

The Delta variant is the variant of SARS-CoV-2 that was first identified in India. While the initial samples of the B.1.617 lineage were collected earlier in 2020, this variant became prominent and was widely recognized and tracked as the "Indian variant" before the WHO assigned the "Delta" label in May 2021. The question refers to its discovery around October 2020, which aligns with the period when the B.1.617 lineage was circulating and being identified in India, eventually leading to the rise of the Delta variant.

Therefore, based on the common identification of the B.1.617 lineage as the Indian variant and its subsequent naming as the Delta variant by the WHO, the official name linked to the Indian variant discovered around that time is the Delta Variant.

Revision Table: Key COVID-19 Variants

Additional Information: COVID-19 Variant Classification

Scientists use different systems to classify and name SARS-CoV-2 variants:

• Lineage Naming Systems: Systems like Pango lineages (e.g., B.1.617) provide a detailed phylogenetic classification showing the evolutionary relationships between virus samples.
• WHO Labels: The World Health Organization (WHO) introduced simplified labels using Greek letters (Alpha, Beta, Gamma, Delta, etc.) for variants of concern and variants of interest to facilitate public communication and discussion, moving away from location-based names.
• Variant of Concern (VOC): A variant that meets the definition of a Variant of Interest and, through a comparative risk assessment, has been demonstrated to be associated with one or more of the following changes: increase in transmissibility or detrimental change in COVID-19 epidemiology; increase in virulence or altered clinical disease presentation; or decrease in effectiveness of public health and social measures or available diagnostics, vaccines, and therapeutics. Delta was classified as a VOC.