The World Health Organization (WHO) has announced the emergence of a new COVID-19 variant, designated ‘NB.1.8.1,’ which is currently spreading in several parts of the world and raising concerns among global health authorities.
The WHO has classified NB.1.8.1 as a “variant under monitoring” due to its increasing prevalence and its potential to partially evade immunity gained from previous infections or vaccinations.
According to WHO data, ‘NB.1.8.1’ is a descendant of the Omicron JN.1 lineage and was first detected in late January 2025. Since its discovery, the variant has rapidly gained ground, accounting for 10.7 per cent of all globally sequenced COVID-19 cases between April 21 and April 27. This represents a significant rise compared to just 2.5 percent one month earlier, highlighting its swift spread.
Most of these new cases have been reported in regions including the Eastern Mediterranean, Southeast Asia and the Western Pacific. The variant has also been detected in the United States, where the Centres for Disease Control and Prevention (CDC) confirmed a small number of ‘NB.1.8.1’ infections, primarily among travellers arriving at airports in California, Virginia, Washington and New York.
Despite its rapid spread, current evidence indicates that ‘NB.1.8.1’ does not cause more severe illness compared to earlier COVID-19 strains. Symptoms remain similar to those of previous variants, including sore throat, cough, fever and fatigue. There is no indication that this variant leads to increased hospitalizations or death.
In Nigeria, no cases of ‘NB.1.8.1’ have been reported so far. However, health experts warn that the risk of importation remains high due to ongoing international travel. The Nigeria Centre for Disease Control and Prevention (NCDC) has assured the public that it is closely monitoring the situation. The NCDC is collaborating with international health bodies to track any possible entry of the variant into the country.
One concern raised by experts is ‘NB.1.8.1’’s ability to partially evade immunity. This means that individuals who have previously contracted COVID-19 or have been vaccinated may still be vulnerable to reinfection. Nevertheless, current vaccines continue to offer significant protection, especially against severe disease and hospitalisation.
Vaccine manufacturers such as Pfizer and Moderna are already developing updated booster shots that are expected to provide enhanced protection against newer subvariants like ‘NB.1.8.1’ and its close relative, LP.8.1.
Health experts in Nigeria have urged citizens to remain vigilant and proactive. They recommend that all eligible individuals get vaccinated or receive booster doses to strengthen their immunity against the evolving virus. Additionally, preventive measures such as regular hand washing, wearing face masks in crowded or poorly ventilated spaces and staying home when feeling unwell remain crucial.
Experts also advise the public to stay informed by following updates from trusted sources such as the NCDC, WHO, and other credible health organisations.
In summary, ‘NB.1.8.1’ is a rapidly spreading COVID-19 variant that has drawn global attention. Although it does not appear to cause more serious illness, its ability to spread quickly and partially bypass immunity poses a concern. Nigerians are encouraged to remain cautious, maintain preventive practices, and keep their vaccinations up to date to protect themselves, their families and their communities.
