The hunt for herd immunity: Suddenly, the U.S. seems in better shape on COVID-19
The hunt for herd immunity: Suddenly, the U.S. seems in better shape on COVID-19 Alexander Panetta © Paul Sancya/AP The U.S. is farther down the path to herd immunity on COVID-19 than Canada due to two factors: higher infection rates at the outset and, now, much higher vaccination rates, including this health-care worker in Michigan on Jan. 5. For the last year, stories about hard-hit American communities clobbered by COVID-19 served as a cautionary tale. Its worst-hit states like North Dakota, South Dakota, and Arizona evoked a mixture of pity and horror at an out-of-cont...