New covid-19 strains: What scientists know about coronavirus variants
3 years, 11 months ago

New covid-19 strains: What scientists know about coronavirus variants

Live Mint  

Scientists around the world are scrambling to learn more about previously unknown variants of the coronavirus that seem to spread from person to person more readily than other versions of the Covid-19-causing pathogen. Some doctors worry that the new variants of the coronavirus could supercharge the spread of Covid-19, putting additional stress on hospitals and nursing homes when cases are near their historic highs. Scientists don’t think so, at least in the U.K. As evidence, Prof. Neil Ferguson, an epidemiologist at Imperial College London and a member of a scientific panel that advises the British government on respiratory-virus threats, pointed to epidemiological data from November showing that cases of the new U.K. variant were exploding in the area southeast of London as coronavirus cases were falling in other parts of the country. The mutations “raise some questions about vaccine efficacy, but it’s important to note that the vaccines elicit a broad immune response…that targets several areas of the spike protein," said Dr. Richard Lessells, an infectious-disease specialist at the University of KwaZulu-Natal in Durban, South Africa, and a member of the team that discovered the South African variant. That research involves experiments in cells and in animals to test whether the new variants attach to and enter cells more efficiently; whether they replicate more readily; and, most important, whether they sp Animal studies involving an earlier coronavirus variant convinced some scientists that its particular mutations made it more infectious, said Dr. William Hanage, a Harvard T.H.

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