COVID-19 appears to be on the rise in some parts of California as a new, highly contagious subvariant — featuring "razor ...

Key Takeaways NB.1.8.1 may make up over one-third of current U.S. COVID-19 casesThe variant is spreading fast, but doesn’t ...

NB.1.8.1 — a new COVID-19 variant tied to a surge in China — now accounts for around 37% of cases in the U.S., according to variant proportion estimates from the CDC. Four notes: ...