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.
The world is worried about the Delta virus variant. Studies show vaccines are effective against it.Israel reported that the Pfizer vaccine was 64 percent effective against the Delta variant. Other studies suggest a higher rate.The world is worried about the Delta virus variant. Studies show vaccines are effective against it.