A 2017 outbreak in Minnesota saw 79 cases confirmed, many in a community with low vaccination rates, though the outbreak's source was never identified. (sciencenews.org)
Yet the practice still lags among less affluent and less educated women whose babies, for reasons including low vaccination rates and greater exposure to environmental contaminants such as cigarette smoke, especially need the nutrients and disease protection mother's milk bestows. (articles.chicagotribune.com)
She also looked at a population in Vashon, Washington which has historically low vaccination rates, and did show that the less a population is vaccinated, the less the prevalence of peanut allergies. (home.allergicchild.com)