MIN READMay 28, 2019 | 05:45 GMT

(JIM WATSON/AFP/Getty Images)

Outbreaks of vaccine-preventable diseases, including measles, mumps and whooping cough, have again become an issue in Western and developed countries. Developing or conflict-ridden countries have far more cases of malaria and other diseases, but infection rates in the United States and Europe are on the rise. The number of cases is lower than in developing countries, but outbreaks in economically advanced countries can create sudden and sharp disruptions....