New COVID-19 variant known as NB.1.8.1 is drawing global attention, particularly among public health officials in the United States. Although this variant has been circulating in the US since late March, there is currently no indication of a significant increase in infections. This comes as there has been a resurgence of coronavirus across the world. According to the most recent data, the positivity rate for COVID swabs, which reflects the proportion of tests returning positive, has actually declined by 12 per cent in the latest week of available figures. This decline suggests that while the new variant is present, it has not triggered a broader surge in cases.The US Centres for Disease Control and Prevention (CDC) receives data on emerging variants through a traveler-based surveillance program at select airports. Operated in partnership with biotechnology firm Ginkgo Bioworks, the initiative allows international travellers to voluntarily provide nasal swabs and complete a brief health survey. The samples are then screened for a range of infectious diseases, including Covid-19.Between April 22 and May 12, several cases of the NB.1.8.1 variant were identified through this program. Although the numbers remain low, experts are keeping a close watch on the strain due to its rapid spread in parts of Asia and its growing dominance in China.Taiwan is one country seeing a marked impact from the variant. The island recently reported over 19,000 healthcare visits for COVID-related symptoms in a single week. Local health authorities confirmed that NB.1.8.1 is now the dominant strain circulating in the country. Early laboratory studies from China suggest that the NB.1.8.1 variant may have enhanced ability to bind to human cells, which could potentially make it more infectious than previous strains.Public health officials in Hong Kong have responded to the variant's emergence by advising high-risk individuals to wear masks in public places and urging all residents to use face coverings while on public transportation or in crowded areas.In the US, the Food and Drug Administration (FDA) recently convened a meeting to assess potential updates to COVID-19 vaccines. While the current vaccines are designed to protect against the JN.1 variant and its offshoots, NB.1.8.1 was discussed during the session due to its international spread and evolving characteristics.The dominant variant in the US remains LP.8.1, a descendant of JN.1. However, only one strain — known as XFC — has shown noticeable growth in the country so far, according to updates shared by the CDC and FDA during the meeting. Although NB.1.8.1 has yet to cause widespread concern domestically, health experts continue to monitor its trajectory. Vigilance remains key, particularly as global travel increases and variants can quickly cross borders.