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COVID New variant

🧬 What is Nimbus?

A subvariant of Omicron (NB.1.8.1), designated a “variant under monitoring” by the WHO in late May 2025 timesofindia.indiatimes.com+15houstonchronicle.com+15kcci.com+15.


Detected across multiple regions—including the U.S., Southeast Asia, Eastern Mediterranean, Western Pacific, and India fox13news.com+3houstonchronicle.com+3economictimes.indiatimes.com+3.


By mid-May 2025, derived roughly 11% of global sequenced cases, and by early June, composed about 37% of U.S. samples kcci.com+3apnews.com+3ketv.com+3.


“Razor-Blade” Throat: Myth or Marker?

Many describe throat pain as feeling like swallowing shards of glass or razor blades facebook.com+7houstonchronicle.com+7sfchronicle.com+7.


However, sore throat is a common COVID symptom—up to 70% of cases reported mild to severe throat pain—even before Nimbus emerged people.com+2sfchronicle.com+2healthline.com+2.


Medical experts caution the sensation may be anecdotal, emphasizing no solid evidence that Nimbus causes more severe throat issues than earlier variants sfchronicle.com+15healthline.com+15apnews.com+15.


Severity & Transmissibility

Nimbus appears to be slightly more transmissible than other Omicron strains, possibly due to mutations enhancing binding to ACE2 receptors facebook.com+14houstonchronicle.com+14healthline.com+14.


Importantly, current data do not show increased severity, hospitalizations, or deaths compared to prior variants apnews.com+1healthline.com+1.


Vaccines & Treatments

Existing COVID vaccines—including updated boosters—remain effective in preventing severe disease from Nimbus people.com+2houstonchronicle.com+2indianexpress.com+2.


Approved antiviral treatments (e.g., Paxlovid) are still valid options local12.com.


Symptoms & When to Seek Help

Common Symptoms:

Intense sore throat (the famed “razor blade” pain)


Fever, cough, congestion, fatigue, body aches


Possible GI symptoms: nausea, diarrhea, hoarseness ctinsider.com+9local12.com+9timesofindia.indiatimes.com+9


What to Watch For:

Severe throat pain lasting over a week


Difficulty swallowing, weight loss, or persistent shortness of breath timesofindia.indiatimes.com+6healthline.com+6sfchronicle.com+6


If experiencing these, get tested for COVID, strep throat, and other infections.

▶️ How to Stay Safe

Maintain good hygiene: handwashing, masking (in crowded places), ventilation apnews.com+2healthline.com+2facebook.com+2.


Stay up to date on COVID vaccinations and boosters, especially for the vulnerable: older adults, immunocompromised, or those with co‑existing health conditions .


Test promptly if symptoms appear, and consider antiviral medications when appropriate .


Bottom Line

Nimbus is spreading quickly and may be slightly more contagious than recent Omicron strains. It’s often accompanied by a pronounced sore throat—leading to the dramatic “razor blade” nickname—but it does not appear to be more severe. Vaccines and treatments remain effective, and core public health measures are still your best defense.

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