Researchers compared areas with significant numbers of parents who chose not to vaccinate their children for nonmedical reasons to areas that were affected by the 2010 whooping cough outbreak in California. They found that people living in areas with high nonmedical vaccine exemption rates were 2.5 times more likely to also be located in an area with high levels of whooping cough.
"Not vaccinating your child is not a benign decision. It has real health consequences to the individual child and to the community," explained study senior author Saad Omer, an associate professor of global health, epidemiology and pediatrics at Emory University in Atlanta.