Using a straightforward systems approach, Public Health: What It Is and How It Works explores the inner workings of the complex, modern U.S. public health system-what it is, what it does, how it works, and why it is important.The book covers the origins and development of the modern pubic health system; the relationship of public health to the overall health system; how the system is organized at the federal, state, and local levels; its core functions and how well these are currently being addressed; evidence-based practice and an approach to program planning and evaluation for public health interventions; public health activities such as epidemiological investigation, biomedical research, environmental assessment, policy development, and more.Updated and New Information in the Fifth Edition:- NACCHO Profile data from 2008 and 2010 surveys- Accreditation of public health agencies- Public health workforce development activities including the credentialing of public health workers- Health reform provisions enacted in 2010- Updated and revised section on public health financing