We are doctors who trained continents apart: one of us in Sweden (Peterson) and one in India (Pai). As we worked during the 1980s and ’90s in those disparate countries, neither of us ever saw a case of measles, diphtheria, or whooping…

We are doctors who trained continents apart: one of us in Sweden (Peterson) and one in India (Pai). As we worked during the 1980s and ’90s in those disparate countries, neither of us ever saw a case of measles, diphtheria, or whooping…