The population in problem is as small as a handful of folks or as big as each of the inhabitants of several continents (For example, in the case of the pandemic). Community health has a lot of sub-fields, but ordinarily involves the interdisciplinary categories of epidemiology, biostatistics and health providers. https://ebooks-online77642.answerblogs.com/31114838/new-step-by-step-map-for-travel