Three activities of houseflies that affect humans?

1. Disease transmission: Houseflies are known carriers of various disease-causing microorganisms such as bacteria, viruses, and parasites. They can pick up pathogens from garbage, feces, and decaying organic matter and then transfer them to human food and surfaces. This can lead to the spread of diseases like diarrhea, cholera, typhoid fever, and dysentery.

2. Food contamination: Houseflies have a habit of landing on food and regurgitating digestive enzymes onto the surface to liquefy it before consuming. During this process, they can contaminate the food with bacteria and other pathogens present on their bodies or in their digestive systems. Consuming such contaminated food can cause food poisoning and other gastrointestinal illnesses in humans.

3. Allergies and irritation: Houseflies can cause allergies and irritation in humans due to their saliva, feces, and body parts. When they come into contact with human skin, they can cause itching, redness, and swelling. Additionally, their presence and buzzing sound can be annoying and disruptive, especially in large numbers.

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