Blow flies prefer to lick animal carcasses and droppings. If food for blow flies is contaminated by pathogens, the flies might ingest significant numbers of pathogens. One possible mechanism for mechanical transmission of pathogens by blow flies is regurgitation and the feces on the food source [13, 14] . The effectiveness of mechanical transmission through regurgitation may depend on the viability and titer of pathogens in the fly's body. The accumulated droppings at a poultry farm should be a good breeding site for blow flies. If the flies reproduced at a poultry farm, they should have many opportunities for contact with viruses in the feces of infected chickens and/or their dead bodies.