>At least in the US, my lay-intuition is that you wouldn't see much of a difference between average Americans between urban, suburban, and rural settings. It w

>At least in the US, my lay-intuition is that you wouldn't see much of a difference between average Americans between urban, suburban, and rural settings. It wouldn't surprise me, but that would call into question the entire notion that the article is attempting to create -- that urban (and therefore non-urban) is the key factor in the differences it mentions in gut flora.