covid

Nearly 3 years into the pandemic, SARS-CoV-2 seems to be still up to the challenge of finding new ways around the immunity humans have built up through vaccines and countless infections. Several new and highly immune-evasive strains of the virus have caught scientists’ attention in recent weeks; one or more may well cause big, new

Last year, the World Health Organization (WHO) began assigning Greek letters to worrying new variants of the coronavirus. The organization started with Alpha and swiftly worked its way through the Greek alphabet in the months that followed. When Omicron arrived in November, it was the 13th named variant in less than a year. But 10