As St George's University, Master of Public Health (MPH) program celebrates its 20th anniversary in 2019, there have been significant gains and challenges to the public's health. The old adage. At the end of this second decade of the 21st century, one of the main tools of public healthâ€vaccinationâ€is having an anti-vaccination experience. Lost memory of diseases prevented by vaccines and misinformation has led to an increase in vaccine refusal. This has resulted in the return of many cases of preventable communicable disease, including measles. In this book, we present a range of papers dealing with current public health issues relevant to professionals in the public health arena.