Importance of understanding fecal-oral route

The fecal-oral route is the transmission of pathogens from the faeces of an infected person (or animal) into the mouth of another person, through water, hands, flies, soil or food. Understanding this route is important because it tells us where to put barriers to stop the most common infectious diseases in developing countries like Nepal.

Diseases transmitted

The route (F-diagram)

             +--> Fluids (water) ------+
             +--> Fingers -------------+
 FAECES -----+--> Flies ---------------+--> FOOD --> MOUTH
             +--> Fields/soil ---------+

Importance of understanding the route

1. Identifies the real cause of disease – people often blame fate or weather; knowing that diarrhoea comes from faeces makes them accept toilets and hand washing. Example: cholera outbreaks in Kathmandu valley in the monsoon are linked to contaminated pipe water and tanker water.
2. Helps choose the right barrier
   • Primary barrier: toilets and safe disposal of faeces stop pathogens entering the environment.
   • Secondary barriers: safe water, hand washing, food hygiene and fly control stop them reaching the mouth. Example: in the 2009 Jajarkot diarrhoea epidemic, many deaths were linked to open defecation and unsafe water sources; latrines and safe water were part of the response.
3. Guides engineering design – water supply intakes away from latrines, minimum distance between pit latrine and well (about 15 m or more, and downhill), separate sewer and water pipes, sewage treatment.
4. Focuses health education – teaching hand washing at five critical times (after toilet, after cleaning a child, before cooking, before eating, before feeding a child).
5. Low-cost prevention – hand washing with soap is among the cheapest ways to cut diarrhoea; treatment of water (boiling, chlorine, SODIS) is cheap compared to hospital costs.
6. Protects children – children under five suffer most; malnutrition and stunting are linked to repeated gut infections.
7. Supports national programmes – Nepal's Open Defecation Free campaign (ODF declared in 2019) and Total Sanitation drive are based on breaking this route.
8. Disaster response – after floods or the 2015 earthquake, the first priority was safe water and toilets in camps to prevent outbreaks.

Example of breaking the route in a village: build a pour-flush latrine, put a hand-washing station with soap next to it, protect the spring source, store water in covered vessels and cover food. Each step removes one "F" from the diagram.