Here's the NY Times about the same " farm effect" study as ABC but in much more detail.
http://www.nytimes.com/2013/11/10/op...=opinion&_r=1&
Here's a citation.
The working hypothesis is that innocuous cowshed microbes, plant material and
raw milk protect farming children by favorably stimulating their immune systems throughout life, particularly early on. That spring morning, Dr. Holbreich gave me a tour of the bonanza of immune stimuli under consideration.
Here's another article on Amish kids about the same study as ABC roped of the new york times
http://foodfreedomgroup.com/2012/05/...omotes-health/