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However, on July 9, Public Health England reported that the Delta variant in England had a case fatality rate (CFR) of 0.2%, while the Alpha variant's case fatality rate was 1.9%, although the report warns that "case fatality rates are not comparable across variants as they have peaked at different points in the pandemic, and so vary in ...
The Alpha variant (B.1.1.7) was [2] [3] a SARS-CoV-2 variant of concern. It was estimated to be 40–80% more transmissible than the wild-type SARS-CoV-2 (with most estimates occupying the middle to higher end of this range).
The CDC reported that 66% of COVID-19 cases between April 11 and 24, 2021, were caused by the alpha variant. Pfizer-BioNTech, Johnson and Johnson, and Moderna said their vaccines prevented severe ...
The Delta variant, also known as B.1.617.2, G/452R.V3, 21A [75] or 21A/S:478K, [97] was a globally dominant variant that spread to at least 185 countries. [137] It was first discovered in India . Descendant of lineage B.1.617, which also includes the Kappa variant under investigation, it was first discovered in October 2020 and has since spread ...
As free tests are now available, one COVID-19 variant continues to be the most prevalent in the United States. Free COVID tests return as CDC says this one variant now accounts for nearly 60% of cases
The U.S. Centers for Disease Control and Prevention (CDC) has described the Delta variant of the coronavirus as being as transmissible as chickenpox and cautioned it could cause severe disease ...
Alphacoronaviruses (Alpha-CoV) are members of the first of the four genera (Alpha-, Beta-, Gamma-, and Delta-) of coronaviruses. They are positive-sense, single-stranded RNA viruses that infect mammals, including humans. They have spherical virions with club-shaped surface projections formed by trimers of the spike protein, and a viral envelope.
The AY.4.2 variant is a new sub-lineage of Delta. The CDC says "there is no evidence" that it is more transmissible, or that it could evade vaccines.