Q. Housefly spreads
✅ Correct Answer: (A)
Typhoid
Explanation:
Houseflies are mechanical carriers of various diseases because they move between contaminated food, waste, and human settlements, carrying pathogens on their legs and mouthparts.
- Typhoid is caused by the bacterium Salmonella typhi and spreads through the fecal-oral route. Houseflies transmit the bacteria by contaminating food and water.
Why Other Options Are Incorrect:
- (B) Common Cold & (D) Flu → These are caused by viruses (like Rhinovirus and Influenza virus), which spread mainly through airborne droplets, not houseflies.
- (C) Malaria → Caused by the Plasmodium parasite, which is spread by female Anopheles mosquitoes, not houseflies.
Thus, houseflies primarily spread typhoid by contaminating food and water.
Explanation by: Official MCQ Buddy
Houseflies are mechanical carriers of various diseases because they move between contaminated food, waste, and human settlements, carrying pathogens on their legs and mouthparts.
- Typhoid is caused by the bacterium Salmonella typhi and spreads through the fecal-oral route. Houseflies transmit the bacteria by contaminating food and water.
Why Other Options Are Incorrect:
- (B) Common Cold & (D) Flu → These are caused by viruses (like Rhinovirus and Influenza virus), which spread mainly through airborne droplets, not houseflies.
- (C) Malaria → Caused by the Plasmodium parasite, which is spread by female Anopheles mosquitoes, not houseflies.
Thus, houseflies primarily spread typhoid by contaminating food and water.