Why don't people get the smallpox vaccine anymore?

After world health authorities declared smallpox had been eradicated from nature in 1980, Wyeth stopped making the vaccine. The U.S. Centers for Disease Control and Prevention (CDC) kept a stockpile for use in case of emergency. In 2003 this supply helped contain an outbreak of monkeypox in the United States.

Explanation:

that is wrong, its not thymus.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.