A new COVID-19 subvariant called NB.1.8.1, nicknamed “Nimbus”, is spreading rapidly across the U.S.—and especially in California, where health officials say it could soon account for over half of all active cases.
First identified in China, the Nimbus variant now makes up around 37% of U.S. cases, according to the CDC. In California, it’s rising even faster—from just 2% in April to a projected 55% of circulating strains today.
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- 1 What Makes the Nimbus Variant Stand Out?
- 2 How Are Officials Tracking It?
- 3 What About Hospitalizations?
- 4 How to Stay Protected
- 5 Free Testing & Vaccines in Fresno County
What Makes the Nimbus Variant Stand Out?
One of its most noticeable symptoms is being called “razor blade throat”—a severe sore throat that some describe as feeling like swallowing shards of glass. Other common symptoms include:
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Persistent cough
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Headache
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Nasal congestion
“This version of the virus is spreading fast and is very painful for some patients,” said Dr. Trinidad Solis with the Fresno County Department of Public Health. She also noted that cases are currently climbing in both northern and southern California.
How Are Officials Tracking It?
Fresno County is using wastewater surveillance to track Nimbus locally. Solis confirmed that recent samples show its presence is growing in the region.
“We are starting to see COVID cases rise in our region,” she warned.
What About Hospitalizations?
Despite the spread of Nimbus, hospitalizations remain low nationwide. While test positivity rates have increased slightly, CDC wastewater data still shows relatively low overall viral activity.
How to Stay Protected
Health experts are urging the public to continue with basic safety steps:
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Wash hands frequently
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Mask up in crowded indoor spaces
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Stay up to date with vaccinations
The 2024–2025 COVID vaccines still offer strong protection against the Nimbus variant, and updated boosters for emerging strains are expected to be released this fall.
Free Testing & Vaccines in Fresno County
Residents can still access two free COVID-19 test kits while supplies last. Mobile health units are also providing free vaccines—no ID or insurance required.
With cases on the rise again, public health officials hope awareness of Nimbus’ painful symptoms and quick spread will encourage more people to take precautions.
