UK, US on alert for Omicron's JN.1 sub-variant

CDC estimates JN.1 accounts for 15–29% of new infections in the US as of December 8

In addition to seasonal flu and white lung syndrome, the mass illness in the UK and other parts of the world may be caused by another cause, the Omicron JN.1 sub-variant.

The Independent newspaper on October 9 quoted a report from the ZOE Health Research project saying that as of December 6, the UK health agency recorded 97,904 cases of Covid-19 infected with JN.1.

Professor Azeem Majeed, head of the department of public health and care at Imperial College London (UK), said JN.1 "is currently the fastest spreading variant in the UK at the moment".

JN.1 is a sub-variant of BA.2.86 from Omicron. This sub-variant has mutations in the spike protein compared to BA.2.86 as well as mutations elsewhere.

According to the latest UKHSA data, the spread rate of JN.1 is now 84.2%/week.

The CDC estimates that JN.1 accounts for 15–29% of new infections in the US as of December 8.

The World Health Organization (WHO) is monitoring the Covid-19 pandemic following the emergence of a new sub-variant.

Where was JN.1 first discovered?

JN.1 was first detected in Luxembourg in August. This sub-variant has now spread to 12 countries, including the UK and the US.

Prof Majeed said the symptoms of the JN.1 sub-variant were similar to those of other variants. According to UK health advice, patients can treat themselves at home, but if they develop more serious symptoms, such as shortness of breath, they should seek medical attention.

British doctor Nighat Arif said that in addition to symptoms such as fever, runny nose, headache, the new sub-variant and the Pirola variant can cause patients to temporarily lose their sense of smell and may have diarrhea.

Professor Sheena Cruickshank of the University of Manchester (UK) warned that mutations in the spike protein mean people with JN.1 may take longer to recover and may have more severe illness than other variants.

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