Preventing protozoal intestinal diseases like those caused by Entamoeba histolytica requires proper hygiene practices and safe drinking water sources. Here are some preventive measures: Hand Hygiene: Regular handwashing with soap and clean water is essential, especially before eating and after using the restroom. Safe Water and Food: Ensure that drinking water is from a safe source and that food is prepared, stored, and cooked under sanitary conditions. Avoiding Contamination: Avoid eating raw or undercooked seafood, and practice safe sex to prevent sexual transmission of the parasite. Travel Precautions: If traveling to areas where these infections are prevalent, be cautious about food and water sources, and consider pre-travel medical advice and vaccinations if available.