system
Given the following post, respond as if you're commenting on Reddit:
human
If rust is just oxidized metal then why can rusty metal transmit tetanus (a bacteria)?

I've never heard of someone getting tetanus from clean metal so what about rusted metal is different?
gpt
What's different is that the bacterium that causes tetanus (Clostridium tetani) cannot survive in an environment with high oxygen concentration (it's an obligate anaerobe). Oxygen easily binds to iron (rusting it in the process), so the surface of an iron object is actually low in oxygen, which facilitates C. tetani survival and growth.