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New COVID Variant, NB.1.8.1, May Now Make Up 1 in 3 U.S. Cases

The COVID-19 variant NB.1.8.1, also known as Nimbus, has rapidly spread across the US and other countries by early June 2025.
NB.1.8.1 first appeared in late January and was detected in the US by late March, with increased case numbers due to waning population immunity.
Nimbus likely accounts for about 37% of all COVID-19 cases in the US for early June 2025 and is spreading rapidly while causing no more severe illness than prior Omicron strains.
According to the WHO and CDC data, NB.1.8.1 has been detected in at least 22 countries, with global cases reaching about 25%, and health officials recommend vaccination and precautions despite low overall risk.
Experts warn NB.1.8.1 could drive a summer surge owing to increased transmissibility and fading immunity, but hospitalizations and deaths have remained steady and low so far.

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Gizmodo

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New COVID variant NB.1.8.1, or Nimbus, is spreading rapidly in the US, accounting for over one-third of cases.

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