The quote below comes from the director of the weapons testing laboratory in the soviet union, the ussr, describing an event in august 1949

When we succeeded in solving this problem, we felt relief, even happiness-for in possessing such a weapon we had removed the possibility of its being used against the USSR with impunity.
That quote? What is the question though?

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.