A pair of new studies yesterday details lower rates of routine vaccinations amid the COVID-19 pandemic, one showing reduced weekly immunization rates and up-to-date status in US children, and the other identifying fewer vaccine doses among both kids and adults in Michigan.Fewer children up to date on immunizationsAn observational study published in JAMA Pediatrics analyzed data from US health systems participating in the Vaccine Safety Datalink, an ongoing collaboration between health plans and the Centers for Disease Control and Prevention.Eight health systems from California, Colorado, Minnesota, Oregon, Washington, and Washington contributed data on children 0 to 18 years from before and during the pandemic.