I want to know the answer to the following question:
How many copper alloys has the EPA approved as antimicrobial materials?
All the background I'm provided with is that "The United States Environmental Protection Agency (EPA) has approved the registrations of these copper alloys as "antimicrobial materials with public health benefits," which allows manufacturers to legally make claims as to the positive public health benefits of products made with registered antimicrobial copper alloys.". Is that enough to answer the question?
Answer: no