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.

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