Quote from the book, "The Power of Probiotics" by Gary W. Elmer , PhD, Lynne V. McFarland, PhD, and Marc McFarland.

"Bacterial and viral diarrheas, including traveler's diarrhea, are leading causes of disease and death throughout the world. The consequences of traveler's diarrhea include dehydration, disruption of a trip (either vacation of business trips), and economic losses for tourists and insurance companies and for tourist related industries (hotels, airlines, attractions, cruise lines, etc.) Due to cancelled or shortened trips. Use of probiotics for traveler's diarrhea is safe and effective."

Probiotics have "multiple methods to deter harmful bacteria...

- production of antimicrobial substances that kill harmful bacteria"
- production of enzymes that destroy or deactivate disease-producing toxins
- stimulation of the immune system to produce more protective antibodies"
- competitive inhibition, which blocks pathogen attachment sites in the colon"