New C ovid variants Nimbus and Stra
New Covid Variants Spread Two new Covid strains — XFB (Stratus) and NB.1.8.1 (Nimbus) — are driving a surge in infections across Britain and the US. UK positivity rates rose from 7.6% to 8.4% in a week, with hospital admissions also increasing. In the US, wastewater data shows rising spread, with four states at “very…