Final answer:
Public health practice is based on obtaining a public health degree such as an MPH, although many also hold medical or related doctoral degrees.
Step-by-step explanation:
The educational preparation that forms the foundation for public health (PH) practice is primarily a degree in public health, such as a master's degree in public health (MPH). However, many professionals in the field also come from medical backgrounds holding an M.D. or a Ph.D. in related fields like biology or microbiology. Thus, for someone working in epidemiology, a field within public health, the typical educational pathway includes an undergraduate degree followed by an advanced degree like an MPH, and possibly further medical or specialized doctoral degrees. This background equips them with the necessary skills to effectively address complex health issues on a population level.