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"It's more support in a growing body of evidence that exposure to pets early in life can stimulate the immune system to do a better job of fighting off infection," Fisher said.
http://www.latimes.com/news/science/la-sci-dogs-cats-babies-health-20120709,0,6527217.story
http://www.latimes.com/news/science/la-sci-dogs-cats-babies-health-20120709,0,6527217.story