How Delta Makes Goal of Herd Immunity Harder to Reach: QuickTake - Bloomberg

7:19pm PDT - August 4th, 2021    health - Bloomberg

Many countries are counting on vaccines to build sufficient immunity in their populations so that SARS-CoV-2, the virus that causes Covid-19, isn’t able to find enough people to infect, causing transmission to eventually stop. But even in countries with a hig…