How does the Delta variant dodge the immune system? Scientists find clues.One dose of vaccine is not enough to protect against the Delta and Beta variants, new research suggests, and even people who have had Covid-19 should be immunized.How does the Delta variant dodge the immune system? Scientists find clues.
Rise of Variants in Europe Shows How Dangerous the Virus Can BeMuch of the continent is experiencing a wave of outbreaks driven by the B.1.1.7 variant, which ravaged Britain this winter.Rise of Variants in Europe Shows How Dangerous the Virus Can Be