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NB.1.8.1: the new COVID variant back on the WHO's radar
Five years after the start of the pandemic that brought the world to a standstill, coronavirus continues to evolve.
The World Health Organization has placed under surveillance a new variant called NB.1.8.1, first detected in January 2025 and already present in several countries in Asia and international tourist destinations.
This mutation, derived from the Omicron strain, has rapidly gained ground and accounts for more than 10% of infections globally. Although the overall risk is considered low, its rapid spread and certain persistent symptoms have led authorities not to lose sight of it.
The symptoms are similar to those already known: dry cough, congestion, sore throat, fever and muscle aches. However, doctors highlight more intense and long-lasting fatigue, loss of appetite and, in some cases, digestive discomfort such as nausea or diarrhoea.
The WHO does not foresee new restrictions, but recommends active surveillance and updating health responses. The protection offered by current vaccines remains effective, making it possible to remain calm without letting down one's guard.