A new Covid variant, NB.1.8.1, is spreading across the world, with India and other countries in Asia reporting a surge in cases.
In the UK, the Health Security Agency confirmed 13 cases of the variant in England in early June, while hospital admissions due to Covid have risen by almost 10 per cent.
However, the true extent of the variant's spread remains uncertain, largely due to a significant reduction in Covid-19 testing compared to the peak of the global pandemic five years ago.
What do we know about the variant NB.1.8.1?
NB.1.8.1 stemmed from the Omicron variant and was first detected in January this year.
It has quickly spread across China and Hong Kong, and has now been recorded in several states across the United States and Australia.
By late April, NB.1.8.1 comprised about 10.7 per cent of submitted sequences globally, according to the World Health Organization (WHO). This rose from just 2.5 per cent a month before.
The WHO declared the NB.1.8.1 strain a “variant under monitoring” on 23 May, which means scientists believe it could potentially affect the behaviour of the virus.
Why has there been a surge in new cases?
Lara Herrero, a virologist from Griffith University in Australia, suspects that NB.1.8.1 spreads more easily than other variants.
“Using lab-based models, researchers found NB.1.8.1 had the strongest binding affinity to the human ACE2 receptor of several variants tested, suggesting it may infect cells more efficiently than earlier strains,” Dr Herrero wrote last month in The Conversation.
Dr Chun Tang, GP at UK private healthcare centre Pall Mall Medical, said: “NB.1.8.1 isn’t too different from the Omicron variant, but it does have some tweaks to its spike protein, which might make it spread a bit more easily or slip past some of our existing immunity.
“That said, early signs suggest it doesn’t seem to cause more serious illness, but of course, we’re still learning more about it.”
“Its spread has been identified in around 22 countries,” said Dr Naveed Asif, GP at The London General Practice.
“The WHO assesses the additional risk to the global public as currently low, and existing Covid-19 vaccines are considered effective in preventing severe disease.”
However, the “Nimbus” variant, as it has been dubbed, does appear to be more transmissible than previous strains, with notable increases reported in India, Hong Kong, Singapore and Thailand, notes Dr Asif.
What are the symptoms?
Common symptoms of Nimbus include a severe sore throat, fatigue, mild cough, fever, muscle aches and congestion.
It has also been reported that some patients have experienced gastrointestinal symptoms such as nausea and diarrhoea.
Healthcare experts have stressed, however, that there is no evidence that the new strain is more deadly or serious than previous variants, and that current Covid vaccines are expected to remain effective and protect anyone infected from severe illness.
Should you get vaccinated?
In the UK, the NHS advises that Covid vaccinations are currently unavailable to the public until the early winter roll out, and only to those who need extra protection from the virus.
You may be eligible for a Covid vaccine in early winter if you:
- are aged 75 or over
- are aged 6 months to 74 years and have a weakened immune system because of a health condition or treatment
- live in a care home for older adults
The NHS will get in touch to offer you the Covid vaccine if you are eligible.
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