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Athlete's Foot (Trichophyton mentagrophytes) Bad Breath (Porphyromonas gingivalis) Diarrhea (Campylobacter jejuni) Giardia (Giardia lamblia) Hay Fever (Grass pollen) Kissing Disease (Epstein-Barr) Pimple (Propionibacterium acnes) Ulcer (Helicobacter pylori)