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Gallagher helped her purify water for the group, impressed with how much more convenient it was than a camping straw, which filters bacteria one sip at a time and does not filter viruses and which was all he carried in his bag, though he has neither a naiveté about waterborne illness nor an ironclad digestive tract. A partial list of places where Gallagher has suffered severe gastrointestinal distress includes: Mexico, Costa Rica, and Peru. In Mexico, he also got Hepatitis A. Which is a virus.