The viruses that make up that branch are called "variants." Those mutations then create a new branch of the SARS-CoV-2 evolutionary tree.
If the same mutation appears and spreads in unrelated populations, that suggests it offers an advantage to the virus. These changes, called mutations, are random and usually have no or little consequence for the virus. “A marathon runner does not slow down before the finish line.” SARS-CoV-2 variants are still evolvingĮvery time SARS-CoV-2, the virus that causes COVID-19, replicates during an infection, it can make mistakes and change a little bit. Marion Koopmans, the director of the WHO Collaborating Center for emerging infectious diseases and a member of WHO’s mission to probe the origins of the COVID-19 pandemic says, “The situation is much better than it has been.” But she cautions that with fall and winter approaching, we should remain prepared for another substantial wave. “SARS-CoV-2 evolution is not over,” says Olivier Schwartz, head of the Virus & Immunity Unit at Institut Pasteur, Paris. The coronavirus is continuously evolving and gaining novel mutations to date there have been more than 200 newer Omicron sublineages and their derivatives. While WHO has not anointed any of these recent Omicron derivatives with a Greek letter of their own, experts fear these variants could undermine the new boosters and treatments, leading to a new wave of infections and deaths. nursing home residents have risen nine-fold since the end of April, and by August death rates almost quadrupled in this group, according to the data compiled by the AARP Public Policy Institute and the Scripps Gerontology Center at Miami University in Ohio. In the U.K., symptomatic infections have steadily increased since August 27-the day they hit lowest level this year- according to the ZOE COVID-19 study, an App-based project in which patients enter their symptoms on their phone. Infections over the last three months have been dominated by new sublineages of Omicron: BA.2, BA.2.12.1, BA.4., and BA.5. For the past 10 months the World Health Organisation hasn’t named any new variants, which begs the question: Has the virus stopped evolving?
Then in November 2021, Omicron, a vastly different version of the virus emerged. Ten variants with Greek names-Alpha through Mu-killed millions. Before viewing content on the website or mobile app please read our Terms & Conditions and Privacy Policy.Every few months for the first two years of the pandemic the public learned the name of a new coronavirus variant that had emerged and was more adept at infecting us or causing severe disease.
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