---
title: "Fecal-oral route and preventive measures"
subject: "Water Supply Engineering"
chapter: 4
key: "semester_5/water_supply_engineering:fecal-oral-preventive"
source: https://www.bctengineer.com/q/semester_5/water_supply_engineering/fecal-oral-preventive
site: BCT Engineering
---

# Fecal-oral route and preventive measures

Water Supply Engineering · Chapter 4: Quality of Water

- Asked in: 2078 Bhadra, 2+2 marks
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/water_supply_engineering/fecal-oral-preventive
- Whole chapter: https://www.bctengineer.com/md/semester_5/water_supply_engineering/chapter-4

## Question

Describe the fecal-oral transmission route with a neat sketch. What are the preventive measures that can be adopted to avoid or break this route?

## Short answer

Pathogens from faeces contaminate fluids, fields, flies and fingers, then food and water, reaching the mouth. Prevention includes safe excreta disposal, water treatment, handwashing with soap, food hygiene and fly control.

## Answer

The **fecal-oral route** is the path by which pathogens in the faeces of an infected person reach the mouth of another person.

#### Sketch (F-diagram)
```text
        Faeces
      /  |   |  \
 Fluids Fields Flies Fingers
      \  |   |  /
         Food
          |
      Mouth of new host
```

Faeces carry the germs to **fluids** (water), **fields** (soil), **flies** and **fingers**; from there they contaminate **food** and drinking water, which is swallowed by a new host.

#### Preventive measures (barriers that break the route)
**Primary barriers** (stop faeces from entering the environment):
- Build and use toilets; stop open defecation.
- Safe disposal and treatment of excreta and sewage.

**Secondary barriers** (stop germs reaching the mouth):
- Protect and treat drinking water (chlorination, filtration, boiling); store water safely in covered vessels.
- Wash hands with soap after defecation, after cleaning a baby, before cooking and eating.
- Keep food covered and clean; wash vegetables and fruits; avoid raw or stale food.
- Control flies by covering latrine pits and waste.
- Hygiene education and community-led total sanitation.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. A primary barrier is:
   A. building and using toilets, stopping open defecation
   B. washing hands with soap
   C. covering food
   D. boiling water
   Answer: A. Primary barriers stop faeces entering the environment. (Key point: Primary barrier)

2. Which is a secondary barrier?
   A. Latrine construction
   B. Handwashing with soap after defecation
   C. Sewage treatment
   D. Safe excreta disposal
   Answer: B. Secondary barriers stop germs reaching the mouth. (Key point: Secondary barrier)

3. Flies are controlled by:
   A. raising hardness
   B. adding alum
   C. covering latrine pits and waste
   D. heating pipes
   Answer: C. Flies carry germs from faeces to food. (Key point: Fly control)

4. In the sketch, faeces lead to food through:
   A. fire, fish, feet, fans
   B. filters, fuel, fog, frost
   C. fluids, fabric, fish, fungi
   D. fluids, fields, flies and fingers
   Answer: D. These contaminate food and water. (Key point: F-diagram)

## Related in Water Supply Engineering

- [Fecal-oral disease transmission route](https://www.bctengineer.com/question.md?key=semester_5%2Fwater_supply_engineering%3Afecal-oral-route) — Water Supply Engineering, chapter 4, asked 7×

## Related in other subjects

- [On-site vs off-site sanitation and fecal-oral route](https://www.bctengineer.com/question.md?key=semester_7%2Ftechnology_environment_and_society%3Aonsite-offsite-fecal-oral) — Technology, Environment and Society, chapter 5
- [Fecal-oral infection route and prevention](https://www.bctengineer.com/question.md?key=semester_7%2Ftechnology_environment_and_society%3Afecal-oral-route-prevention) — Technology, Environment and Society, chapter 5, asked 2×
- [Water pollution and fecal-oral route](https://www.bctengineer.com/question.md?key=semester_7%2Ftechnology_environment_and_society%3Awater-pollution-fecal-oral) — Technology, Environment and Society, chapter 5
- [Environmental sanitation and fecal-oral route](https://www.bctengineer.com/question.md?key=semester_7%2Ftechnology_environment_and_society%3Aenv-sanitation-fecal-oral) — Technology, Environment and Society, chapter 5, asked 2×