Which pest is known to expel saliva containing disease-causing bacteria while feeding?

Flies are indeed known to expel saliva containing disease-causing bacteria while feeding. This behavior occurs because flies often feed on decaying organic matter, which can be contaminated with pathogens. When flies land on food or surfaces, they may regurgitate or excrete fluids that contain bacteria, transferring these pathogens to the food or environment.

This is particularly concerning in food safety, as flies can easily spread foodborne illnesses. Understanding the behavior of flies helps in implementing effective pest control measures to prevent contamination in food establishments. Proper sanitation and food handling practices can mitigate the risks posed by flies in food environments.