I don't think it's extremely common, as I had purchased numerous bags of the stuff before I had my incident and I never had a problem. Still, I KNOW the mites came from inside the bag, and not another source. There was another user the other day saying they thought they picked mites up from a bag of aspen.
However, I think it still should be common practice to sterilize with the stuff (baking it as I described before).
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