Fact: There are a few known metals such as brass, copper, aluminum, iron, lead, and silver that are antimicrobial meaning they kill or stop the growth of microorganisms. Brass is the most antimicrobial of them all.
Frequently touched surfaces in the home or public spaces are a safe haven for bacteria. Metals such as brass will actually sterilize themselves overtime ( science) making them an ideal material for doorknobs, handles and locks. Source: Inman