COVID variant NB.1.8.1 is a VUM: What does it say about its severity, symptoms and transmission rate?

A newer COVID-19 subvariant, NB.1.8.1, has been making headlines as it shows signs of spreading more widely. Like other recent strains, it’s a descendant of the Omicron family only, and early data suggests it may be more transmissible but not necessarily more severe, which could be a relief.


NB.1.8.1 is a new strain of the SARS-CoV-2 virus, which causes COVID-19. It's been identified as a subvariant of Omicron, the strain that has been dominant in recent waves. While it's not classified as a "variant of concern" by the World Health Organization, health authorities are keeping a close eye on it due to its rapid spread and potential impact.


NB.1.8.1 is a VUM or variant under monitoring

"NB.1.8.1 has been designated a SARS-CoV-2 variant under monitoring (VUM) with increasing proportions globally, while LP.8.1 is starting to decline," the WHO said in a press release last week.

When a COVID strain like NB.1.8.1 is labeled a Variant Under Monitoring (VUM) by the WHO, it means that experts have noticed some changes in the virus’s genetic makeup that could potentially affect how it spreads, how severe it is, or how well our current vaccines and treatments work against it.

But here’s the thing—just because a variant is being watched doesn’t mean it’s dangerous right away. It simply means scientists are keeping a close eye on it to see if it evolves or becomes more of a threat. In the case of NB.1.8.1, it's showing signs of spreading in different parts of the world, and there are some unique symptoms being reported, but there’s no evidence yet that it causes more severe illness.

Basically, VUM is like a “watchlist” category. The variant hasn’t done anything truly alarming yet, but health officials are tracking it just in case it becomes more serious down the road. It’s a heads-up, not a red alert.


COVID symptoms to watch out forPeople infected with NB.1.8.1 have reported symptoms similar to other Omicron subvariants. These include:

• Persistent cough
• Sore throat
• Fatigue
• Headache
• Loss of appetite
• Gastrointestinal issues
• Blurred vision
• Nausea or dizziness
• Difficulty concentrating

As per a report, a unique symptom reported with this variant is persistent low-grade hyperthermia (not fever). Unlike a typical fever, hyperthermia involves an elevated body temperature without a change in the body's set point. This means the body feels warmer than usual but doesn't necessarily register as a fever.


Should you be concerned?
While NB.1.8.1 is causing a rise in cases, most infections have been mild. Health authorities emphasize the importance of staying up to date with vaccinations, especially for vulnerable populations. Booster doses are recommended for those who haven't received them yet, as they can help reduce the risk of severe illness.


What can you do?
Stay informed: Keep an eye on updates from health authorities regarding the variant's spread and impact.
Get vaccinated: If you're eligible, get your booster shot to enhance protection.
Practice hygiene: Continue regular handwashing and use masks in crowded or enclosed spaces.
Monitor symptoms: If you experience any symptoms, get tested and follow local health guidelines.

Remember, while NB.1.8.1 is a reminder that COVID-19 is still around, staying informed and taking preventive measures can help keep you and your community safe.