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Published online 15 May 2000 | Nature | doi:10.1038/news000518-3
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Late arrival
Our ancient relatives had one less infectious bug to worry about, Hannah Wunsch discovers.
Some bacteria have been with us since the very beginning. Helicobacter pylori -- a bug causing some stomach ulcers and cancers -- was thought to be one of these, infecting humans for millions of years.
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