An example of an infectious disease is: 1-sickle cell anemia
2-small pox
3-Down syndrome
4-diabetes

Small pox is the answer

Explanation: Down Syndrome is something your born with

Sickle Cell Anemia is inherited from your parents

Diabetes comes from your diet

Small Pox is the only one that is a virus that is similar to the flu

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