I'm pretty sure you don't get Lock Jaw from brass. From what I understand it comes rusty steel. here is a quick search:
What is tetanus?
Tetanus, commonly called lockjaw, is a serious bacterial disease that affects muscles and nerves. It is characterized by muscle stiffness that usually involves the jaw and neck that then progresses to involve other parts of the body. Death can result from severe breathing difficulties or heart abnormalities.
Who gets tetanus?
As a result of widespread immunization, tetanus is now a rare disease in the United States. Tetanus occurs more often in older people and in agricultural workers for who contact with animal manure is more likely and immunization is inadequate. Neonatal (newborn) tetanus remains a major problem in many developing countries where women are not immunized appropriately against tetanus.
How is tetanus spread?
In unvaccinated individuals, tetanus is contracted
through a cut or deep wound which becomes contaminated with the organism. Tetanus has also been associated with clean wounds, surgical procedures, insect bites, dental infections, and intravenous drug use. It is not transmitted from person to person.
