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Jan 31, 2024 · The World Health Organization (WHO) has declared it a “variant of interest.” There is no evidence that JN.1 causes more severe disease, the CDC says, but its rapid spread suggests it is either more transmissible or better at evading the immune system than other circulating variants.
Aug 5, 2021 · According to an internal CDC document, the Delta variant – one of four “variants of concern” that have evolved from SARS-CoV-2, the virus that causes COVID-19 – is more than twice as infectious as the original virus and as infectious as chickenpox.
Sep 1, 2023 · New variants are an expected part of the evolution of viruses, and that includes SARS CoV-2, the virus that causes COVID-19. Yale Medicine provides some background on key variants that have surfaced during the course of the pandemic.
Nov 4, 2023 · Concern over variants, sometimes called strains, of the virus that causes COVID-19 is based on how the virus might change. A virus could get better at infecting people, spread faster or cause people to get sicker.
Jun 22, 2021 · The variant is now responsible for more than 80 percent of infections in the United States, largely among unvaccinated people, according to the C.D.C. It is already fueling new outbreaks...
Jun 14, 2022 · Omicron was 3.6 times more likely to infect people with boosters sharing the same house than Delta. But it was barely more likely to infect unvaccinated people.
Jul 2, 2021 · The latest coronavirus variant has spread to about a dozen countries—including India, the U.S., and the U.K.—while scientists scramble to figure out if the strain is more deadly or...
