Population immunity is slowing down the pandemic in parts of the US | MIT Technology Review

Population immunity is slowing down the pandemic in parts of the US | MIT Technology Review: The large number of people already infected with the coronavirus in the US has begun to act as a brake on the spread of the disease in hard-hit states. Millions of US residents have been infected by the virus that causes covid-19, and at least 160,000 are dead. One effect is that the pool of…