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Does Helicobacter pylori protect against asthma and allergy?
  1. M Wjst
  1. Dr W Wjst, Institut für Inhalationsbiologie, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, Neuherberg/Munich, Germany; wjst{at}

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Blaser et al raise the interesting question of whether Helicobacter pylori protects against allergy and asthma (Gut 2008;57:16–24). Although they admit that “this is not a simple concept for most doctors” my main problem is not the dual action where a pathogen may be beneficial in another context but the poorly described “adaptive immunological activity in terms of both T and B cell function”. Such a claim would require a much more detailed outline of the …

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  • Competing interests: None.

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