The pandemic dealt a serious setback to global efforts to immunize children against diseases like measles and polio, the Centers for Disease Control and Prevention reported on Thursday, reducing worldwide coverage for some vaccines to levels not seen since more than a decade ago.
The proportion of eligible children who received a polio vaccine fell to 83 percent in 2020 from 86 percent the year before, as did coverage with the third dose of the diphtheria-tetanus-pertussis vaccine, known as DTP3. Coverage with the measles vaccine also dipped slightly, to 84 percent last year from 86 percent in 2019.
Those setbacks,