How do flies typically spread disease?

Flies primarily spread disease through mechanical transmission. This method involves the fly acting as a carrier that picks up pathogens on its body parts, such as its legs or mouthparts, from contaminated surfaces or materials, and then transfers these pathogens to food or surfaces that humans contact. For example, flies can land on feces or decaying food and then carry bacteria or viruses to fresh food items, potentially infecting humans who consume them.

Understanding mechanical transmission is critical in prevention strategies, which often focus on controlling fly populations and improving sanitation practices to reduce contact between flies and food sources. This highlights the importance of cleanliness and the need for effective waste management in reducing disease spread by flies.