What we know about the new Covid-19 variant NB.1.8.1

The threat of the Covid-19 virus is far from over, as it has once again mutated into a new variant known as NB.1.8.1, leading to a surge in infections in many countries around the world.

It's raising some eyebrows among doctors and scientists because it spreads quickly and might sneak past some of our usual defenses, like past infections or vaccines, reports Times of India.

What exactly is NB.1.8.1?

NB.1.8.1 is a subvariant of Omicron, the version of Covid we've all become a bit too familiar with over the last couple of years.

Since first being recognised in January 2025, the variant has spread to at least 20 countries, including the US, the UK, China, Australia, and Thailand.

The World Health Organization (WHO) is keeping a close eye on it and has labeled it a "variant under monitoring". That basically means it's not time to panic, but it's definitely worth watching because it spreads quickly and might be better at dodging the protection we get from vaccines or past infections.

What are the symptoms of NB.1.8.1?

The symptoms so far look pretty similar to previous Omicron variants, but there may be a few slight differences from person to person.

People are commonly reporting fever and chills, dry, persistent cough, fatigue, sore throat, runny or stuffy nose, headaches, muscle or body aches, and loss of taste or smell.

Not everyone gets all of these, and some people might only have mild symptoms — or none at all. It's also totally possible to think it's just a regular cold or allergies.

Besides the usual cold-like signs, a few people with NB.1.8.1 have mentioned some less common symptoms too: upset stomach, skin rashes, dizziness or confusion.

So far, based on data from other countries where cases have been reported, the variant does not seem to cause more severe disease, however, it is genetically equipped with changes that allow it to infect cells more efficiently. That means it could spread more easily among people.

Who's at higher risk?

So far, most cases seem to be mild, especially for people who are vaccinated or have had Covid before. But, as always, there are groups who need to be more cautious such as older adults (especially those 65+), people with weakened immune systems, unvaccinated people, and those who haven't had any booster shots.

How can you protect yourself?

The usual Covid safety stuff still works here. Just the basics: stay up to date on your vaccines and booster shots, and wear a mask at crowded places.

Wash your hands regularly with soap and water (or use hand sanitizer if you're out and about).

Also, keep some distance from people who are coughing or not feeling well. No need to be paranoid, but be smart.