Why did the USSR start the Berlin Blockade? O They didn't like the new currency which was introduced to Germany and Berlin O They wanted to contain the spread of communism O They were responding to the Berlin Airlift O They did not like the location of the quarter of Berlin they were in charge of after WWII​

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.