A new COVID-19 variant, NB.1.8.1 or "Nimbus", is causing a rise in cases in some regions, particularly the eastern Mediterranean, Southeast Asia, and western Pacific. Characterized by a painful "razor blade throat," the variant has been detected in the US. While cases and hospitalizations have increased in some areas, the World Health Organization (WHO) considers the global health risk low and current vaccines effective. The WHO classifies Nimbus as a "variant under monitoring."

Prepared by Olivia Bennett and reviewed by editorial team.