Read the excerpt from “Albert Schweitzer: A Life of Service and Sacrifice.” In 1953, when Albert had been serving the world for forty-eight of his seventy-eight years, the world decided to serve him. He was granted the Nobel Peace Prize. Albert traveled to Norway to accept the award. Then, still true to the pledge he had made so many years before, he returned to Africa and used the prize money for a hospital addition. He was still there selflessly serving others when he died in 1965.

What is the big-picture idea in this excerpt?

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.