Did you know that common house flies carry TWICE as many germs as cockroaches! 61% of people say that they would leave a restaurant if they saw a cockroach - it sounds like to me you need to drop you fork and run when you see flies.
House flies are most common and found pretty much everywhere. Flies are overall just GROSS - they eat garbage, animal droppings, rotting food and other germ carrying things. It only take a fews second for them to transfer these germs to you or your food - so be sure to stay clear.
House flies are also known to carry 5 serious bacteria that cause harmful diseases. Some of these include: cholera, dysentery, anthrax, tuberculosis and typhoid fever.
If you see flies around your food at a restaurant be sure to steer clear and tell the owner they need to call a pest control company like PestFix who has an extensive pest management program for fly control. Their fly control program is known to rid upwards of 90% of flies within only a few weeks of treatment.