For generations of most American families, getting children vaccinated was just something to check off on the list of back-to-school chores. But after the ferocious battles over Covid shots of the past two years, simmering resistance to general school vaccine mandates has grown significantly. Now, 35 percent of parents oppose requirements that children receive routine immunizations in order to attend school, according to a new survey released Friday by the Kaiser Family Foundation. Forty-four percent of adults who either identify as Republicans or lean that way said in the latest survey that parents should have the right to opt out of school vaccine mandates, up from 20 percent in a prepandemic poll conducted in 2019 by the Pew Research Center. In contrast, 88 percent of adults who identify as or lean Democratic endorsed childhood vaccine requirements, a slight increase from 86 percent in 2019. The survey found that 28 percent of adults overall believed parents should have the authority to make school vaccine decisions for their children, a stance that in the 2019 Pew poll was held by just 16 percent of adults. The shift in positions appears to be less about rejecting the shots than a growing endorsement of the so-called parents' rights movement. Indeed, 80 percent of parents said that the benefits of vaccines for measles, mumps and rubella outweighed the risks, down only slightly from 83 percent in 2019. The latest survey was based on interviews with a nationally representative sample of 1,259 adults.