Muscidae breed in filth and are vectors of which diseases?

• A. True
• B. False
• C. Not observed
• D. Unknown

Answer: (A)

Muscidae breed in filth and are vectors of disease because house flies and their relatives lay eggs in feces, garbage, and other decaying matter, creating a habitat rich in microbes. As adults move between these dirty sources and human food, they pick up bacteria, viruses, and other pathogens on their bodies, mouthparts, and in their gut. They then transfer those microbes to surfaces, food, and water, often contaminating what people eat. This transmission is mechanical rather than biological—the pathogens aren’t multiplying inside the fly, but are carried by it and deposited wherever the fly lands. Evidence of this includes the spread of gastrointestinal pathogens such as Salmonella, Shigella, and Vibrio species in environments with fly activity. So the statement is true.