COVID cases are rising with new variants 'Nimbus' and 'Stratus': Should we be worried?

The coronavirus is back in the news with two new variants making rounds - Nimbus (NB.1.8.1) and Stratus (XFG). Reports suggest that cases are once again climbing in parts of the UK, US, and Europe, raising an important question: how concerned should people really be this time around?

The new names in the COVID family

Like people, viruses also evolve with time. The latest variants, nicknamed Nimbus and Stratus, are sub-variants of Omicron. Nimbus was first reported in China earlier this year and has since spread across Europe and the US. Stratus, meanwhile, is being picked up more frequently in the UK.

Both are now among the most common strains circulating this autumn. According to the UK Health Security Agency, these do not appear to make people more ill than earlier types, but they are proving to be better at spreading from person to person.

What makes Nimbus stand out

Scientists have found that Nimbus is particularly good at attaching itself to human cells - up to 2.5 times more efficiently than earlier variants. This makes it highly transmissible.

While it doesn’t seem to cause more severe disease, what’s unusual is its symptom profile. Many describe a “razor blade” sore throat or a sharp pain while swallowing in the early days of infection. Other symptoms include fatigue, mild cough, nasal congestion, and in some cases digestive issues like nausea.

It’s not necessarily deadlier, but it certainly makes its presence felt.



Stratus works a little differently. Instead of latching onto cells more strongly, this variant evades immune responses better. It has mutations that help it dodge antibodies, which means infections can happen even in people who were recently vaccinated or infected.
The silver lining is that, much like Nimbus, it hasn’t shown signs of causing more severe illness than other Omicron strains. But its stealthy spread means it can catch people off guard, especially during colder months when flu and RSV are also circulating.

Should there be cause for concern?

Experts stress that while case numbers and hospital admissions are rising, there is no evidence so far that these new variants are more dangerous. Dr Alex Allen, Consultant Epidemiologist at the UK Health Security Agency (UKHSA), said: “Based on the available information so far, there is no evidence to suggest that the variants cause more severe disease or that the vaccines in current use will be less effective against them.”

In other words, the main issue right now is not severity, but speed of spread. This means more people could get sick at once, potentially putting pressure on health systems.

Smart precautions to keep in mind this season

Update vaccinations: Eligible groups, especially the elderly and those with chronic illnesses, are being urged to get their boosters. Vaccines remain the strongest shield against severe illness.

Layer protection, not fear: Think of masks and sanitisers as seasonal gear, much like carrying an umbrella when it rains.

Ventilation matters: Keeping windows open or spending more time outdoors cuts down the risk of airborne spread.

Listen to the body: A stabbing sore throat, persistent fatigue or fever may not just be “a seasonal flu.” Rest and limit contact with vulnerable people until symptoms ease.

Stay practical: Pharmacies still sell test kits and vaccines. For those feeling unsure, a quick test can help avoid spreading the infection further.

Disclaimer: This article is for informational purposes only and should not be taken as medical advice. For personal health concerns or COVID-related guidance, consult a qualified healthcare professional.