How would results differ if you have only a 20% or 50% chance of contracting the disease after being exposed? How does this relate to the concept of susceptibility?

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.