How did the new Covid subvariant NB.1.8.1 spread to US and what can you do to prevent it? Details here

The new Covid-19 subvariant NB.1.8.1, detected in the US after a surge in China, is being closely monitored due to its rapid transmission. Symptoms are similar to previous strains, including mild hyperthermia, respiratory issues, and gastrointestinal problems. Despite its high transmissibility, current data suggests it does not lead to more severe illness. Multiple cases of the new Covid variant have been detected in multiple locations across the United States.