Were you around pets or farm animals growing up? Or maybe you were raised in a zoo like Art (on Monkey Island)? There are some theories that suggest exposure to animals in childhood can impact the development of your immune system.
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This interview (free reg required) with Mark Freedman covers his take on some of the research presented at ECTRIMS. If you like to hear what people in the MS biz think is important, take a look at this interview.