If you're talking about first world street dirt I agree. If you're talking about ancient Mesopotamian city street dirt, I think you're asking for norovirus, dys

If you're talking about first world street dirt I agree. If you're talking about ancient Mesopotamian city street dirt, I think you're asking for norovirus, dysentery, cholera, etc. Yes they had sewers and even pipes, but stormwater and sanitary sewers weren't separate and often relied on open ditches.