The World Health Organization is warning everyone to remain vigilant. The new Omicron sub‑variant, NB.1.8.1, now dubbed “Nimbus,” appears to be spreading faster than previous strains.
Rapid Spread Triggers Global Watch
First detected in January 2025, Nimbus has swiftly dominated parts of Asia, especially in China and Hong Kong. Subsequently, it reached Europe and North America, stirring major concern the-independent.com+15wired.com+15apnews.com+15whn.global+9the-independent.com+9gavi.org+9.
“NB.1.8.1 has quickly spread across Asia and into other regions,” noted the WHO TAG‑VE on 23 May the-independent.com+4gavi.org+4cidrap.umn.edu+4.
By late April, it accounted for roughly 11% of global sequenced cases—up from just 2.5% a month earlier news-medical.net+8cdn.who.int+8gavi.org+8.
Striking Symptoms: ‘Razor‑Blade Throat’
Experts are sounding the alarm about a new symptom. Some patients compare their sore throat to swallowing shards.
“Razor blade throat,” doctors across the UK, India, and California say data.who.int+12apnews.com+12m.economictimes.com+12.
Still, vaccines continue to help prevent severe illness—even against Nimbus whn.global+15apnews.com+15wired.com+15.
What the WHO Says
On 23 May, WHO classified the variant as a Variant Under Monitoring (VUM) cidrap.umn.edu+15cdn.who.int+15kenyans.co.ke+15. They stress the global risk level remains low:
“Considering available evidence, the additional public health risk posed by NB.1.8.1 is evaluated as low at the global level,” WHO experts stated whn.global+11wired.com+11apnews.com+11.
Lab studies also show the variant binds strongly to human cells but does not seem to cause more severe illness unmc.edu+6kenyans.co.ke+6the-independent.com+6.
Mild, But Mutating
Those infected typically report:
- Fatigue
- Fever
- Congestion
- Cough
- Occasional digestive upset m.economictimes.com+12wired.com+12whn.global+12.
In some cases, people experience persistent, low-grade fevers rather than full-blown spikes .
Despite partial immune escape, existing vaccines and antiviral therapies like Paxlovid still work .
Health Agencies Urge Vigilance
WHO and others urge everyone to:
- Stay vaccinated, especially seniors and high-risk groups gavi.org+10wired.com+10indiatimes.com+10.
- Keep up hygiene and continue mask use where possible.
- Support genomic surveillance, share data promptly, and prepare systems for new outbreaks sg.news.yahoo.com+1indiatimes.com+1indiatimes.com+3cidrap.umn.edu+3thesun.ie+3.
The Kenyan Context
In Kenya, COVID remains part of collective memory. The country recorded around 5,689 COVID deaths, while global fatalities hit over 7 million—with even higher excess mortality .
As Nimbus spreads, health authorities must stay alert. Although it’s not a crisis now, complacency could lead to resurgence.
Stay Safe: What You Can Do
- Stay current with your COVID vaccines and boosters.
- Wash hands regularly and use masks in crowded spaces.
- Monitor symptoms like intense sore throats.
- Keep informed and support public health updates.
