about half of the world’s population is infected with H. pylori, although most of them don’t know it (most infected people have no obvious symptoms). For a percentage of the infected, however, the bacterium packs a nasty punch. H. pylori is responsible for most human cases of gastric and duodenal ulcers, and long-term infection is a significant risk factor for stomach cancer, the second leading cause of cancer death worldwide.
Shiga toxin-producing Escherchia coli (STEC) can cause severe enteric infections.
You may want to look at the CDC site for futher info.
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