Immunization rates among kindergartners appear mostly unchanged in Sonoma County. Sonoma County health officials released data showing no significant change in the number of kindergartners with up to date required vaccinations. Those vaccines that are required prior to entering school include DTaP, Polio, Hepatitis B, measles, mumps, and rubella, and chickenpox. The vaccination rate for new kindergartners was at 92.3-percent in 2019, 91.6 in 2020, and 92.6 in 2021. Still several school districts, especially those in West County, are likely below that average. The news comes as about half of kids return to school today, including children attending Santa Rosa City Schools.