What Is the New Quick-Spreading Covid Variant NB.1.8.1?
- The COVID-19 variant NB.1.8.1, also called Nimbus, is spreading globally and was first detected in January 2025 from samples worldwide.
- Experts and the WHO began monitoring NB.1.8.1 due to its high transmissibility and rapid spread, including detections in 22 countries and several U.S. states.
- The variant produces symptoms similar to previous strains, including fever, cough, sore throat, and fatigue, with the sore throat being particularly intense and often described as feeling sharp or painful.
- The CDC reported that NB.1.8.1 accounted for 37% of U.S. COVID-19 cases in early June 2025, with vaccine protections remaining effective against severe disease.
- Authorities are adjusting vaccination policies, focusing boosters on high-risk groups, while vigilance continues due to increased hospitalizations and the variant's potential to drive a summer surge.
21 Articles
21 Articles

Will the new COVID-19 variant that’s on the rise give you a ‘razor blades’ sore throat? Here’s what we know
The variant, NB.1.8.1, is projected to become the most prevalent strain of the virus in Ontario. Here's how to keep yourself safe.
The new variant of covid, the disease caused by the coronavirus, is beginning to be the dominant all over the world. Known under the name NB 1.8.1 or Nimbus, this strain has some unique characteristics.In a report published this Friday, the Mirror notes that one of the symptoms typical of Nimbus is an intense sore throat, which according to this medium, is so acute that it seems "a blade" when it comes to swallowing."It is common for people to r…
COVID Variant NB.1.8.1 Now Driving 37 Percent of Cases in US, Says CDC
A COVID-19 variant that emerged earlier this year in mainland China is now driving an estimated 37 percent of virus cases in the United States, according to new data released by the Centers for Disease Control and Prevention this week. The NB.1.8.1 variant appears to be driving a significant number of COVID-19 cases in China, and instances of the virus were up by 160 percent last month, according to official data from the Chinese regime. Now, U.…
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