Sentences with phrase «nonmedical exemptions differ»

Saad B. Omer, M.B.B.S., M.P.H., of the Johns Hopkins Bloomberg School of Public Health, Baltimore, and colleagues conducted a study to determine if the rates of nonmedical exemptions differ and have been increasing in states that offer only religious vs. personal belief exemptions, and if the incidence of pertussis is associated with policies of granting personal belief exemptions and ease of obtaining exemptions.