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Alpha circulated from late 2020 to late 2021 before it was outcompeted by Delta and then Omicron. Our current vaccines are effective against it. Alpha was less contagious than Beta, Delta, or ...
Delta (B.617.2) First identified in India in late 2020, the delta variant soon spread across the globe. It became the dominant variant of SARS-CoV-2 until the emergence of omicron in December 2021.
The variant, called "Delta with K417N" by Public Health England, includes two clades corresponding to the Pango lineages AY.1 and AY.2. [150] It has been nicknamed "Delta plus" [151] from "Delta plus K417N". [152] The name of the mutation, K417N, refers to an exchange whereby lysine (K) is replaced by asparagine (N) at position 417. [153]
On 11 February 2020, the International Committee on Taxonomy of Viruses adopted the official name "severe acute respiratory syndrome coronavirus 2" (SARS‑CoV‑2). [33] To avoid confusion with the disease SARS , the WHO sometimes refers to SARS‑CoV‑2 as "the COVID-19 virus" in public health communications [ 34 ] [ 35 ] and the name HCoV ...
British epidemiologist Tim Spector said in mid-December 2021 that the majority of symptoms of the Omicron variant were the same as a common cold, including headaches, sore throat, runny nose, fatigue and sneezing, so that people with cold symptoms should take a test. "Things like fever, cough and loss of smell are now in the minority of ...
Here's what experts know so far about the new strains and their symptoms. This winter holiday season may see a COVID-19 surge fueled by a slate of emerging variants. Here's what experts know so ...
As of 7 December 2021 it was known that BA.2, unlike BA.1, lacks the characteristic S-gene target failure (SGTF) causing deletion (Δ69-70), by which many qPCR tests have been able to rapidly detect a case as an Omicron (or Alpha) variant, from the previously dominant Delta variant.
"The omicron symptoms have been pretty consistent. There's less incidence of people losing their sense of taste and smell. ... BA.1 and BA.2 are about as genetically similar as delta was to alpha ...