Public Health is regarded as the basis and cornerstone of health, generally and in medicine. Defined as the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals, this discipline has been renewed by the incorporation of multiple actors, professions, knowledge areas and it has also been impacted and promoted by multiple technologies, particularly - the information technology. As a changing field of knowledge, Public Health requires evidence-based information and regular updates. Current Topics in Public Health presents updated information on multiple topics related to actual areas of interest in this growing and exciting medical science, with the conception and philosophy that we are working to improve the health of the population, rather than treating diseases of individual patients, taking decisions about collective health care that are based on the best available, current, valid and relevant evidence, and finally within the context of available resources. With participation of authors from multiple countries, many from developed and developing ones, this book offers a wide geographical perspective. Finally, all these characteristics make this book an excellent update on many subjects of world public health.