Housefly spreads diseases

Options

A. Typhoid, diphtheria, Tuberculosis and Pertussis
B. Tuberculosis, Tetanus, Pertussis and Diphtheria
C. Gangrene, Poliomyelities, Diphtheria and Typhoid
D. Dengue, Encephalitis, Filariasis and Poliomyelities.

Answer

**Step-by-Step Solution:**

1. **Understanding the Role of Houseflies in Disease Transmission**:
- Houseflies are known vectors that can carry and transmit various pathogens, including bacteria and viruses. They can pick up pathogens from decaying organic matter, feces, and contaminated food.

2. **Identifying Diseases Spread by Houseflies**:
- The question lists several diseases, and we need to determine which ones can be spread by houseflies.
- Common diseases associated with houseflies include typhoid, diphtheria, and some forms of gastroenteritis.

3. **Analyzing Each Disease**:
- **Typhoid**: This is a bacterial infection caused by *Salmonella typhi*, which can be transmitted through contaminated food and water, often facilitated by houseflies.
- **Diphtheria**: Caused by *Corynebacterium diphtheriae*, this disease can also be spread by houseflies as they can carry the bacteria from infected individuals to food or surfaces.
- **Tuberculosis**: This is primarily spread through airborne particles from an infected person, not typically by houseflies.
- **Pertussis (Whooping Cough)**: This is a contagious respiratory disease caused by *Bordetella pertussis* and is spread from person to person, not by houseflies.

4. **Reviewing Incorrect Options**:
- The option listing tuberculosis, tetanus, pertussis, and diphtheria is incorrect because tetanus is not spread by houseflies; it is typically contracted through wounds contaminated with soil or manure.
- The option listing gangrene, poliomyelitis, diphtheria, and typhoid is correct. Gangrene can be associated with bacterial infections that houseflies can help spread, and poliomyelitis can be transmitted in rare cases through contaminated environments.

5. **Conclusion**:
- After analyzing the options, the correct answer is the one that includes gangrene, poliomyelitis, diphtheria, and typhoid, as these diseases can be associated with the transmission by houseflies.

**Final Answer**: The correct diseases spread by houseflies include gangrene, poliomyelitis, diphtheria, and typhoid.

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