Early common infections may play a protective role in the aetiology of childhood leukaemia

This British Journal of Cancer paper suggests that childhood infections may prevent leukemia. 

The study was deigned to determine risks .. so we can't really draw any conculsions about prevention.  But it's an interesting idea.  We'll keep our ears open ...

... and it seems intuitively related to the literature on allergies .. and the observation that the cleaner we live ... the more likely we are to develop allergies.