Outdoor living in wilderness areas w/ingestion of water from streams: Giardia (particularly in
Rocky Mountain region, northern New England). Giardia is the most common water-borne parasite
that causes diarrhea
• Yersinia enterocolitica is found predominantly in cooler geographic areas (e.g., Canada).
• Ingestion of raw shellfish from Gulf of Mexico or Mexico: Plesiomonas shigelloides
• Ingestion of untreated fresh water: Aeromonas hydrophila (particularly in Thailand)
• Travel to Russia: Cryptosporidium, Giardia
• Seasonal variation • Rainy summer season: enterotoxigenic E. coli, Shigella, Salmonella
• Dry winter season: C. jejuni