Flies are very unhygienic and bring an unhealthy enviroment for businesses such as bars, restaraunts and cafes.
They carry a wide range of diseases such as dysentery, gastroenteritis, E-coli, salmonella and parasitic worms.
The usual flies that are a problem are: House fly
Lesser house fly
Fruit and vinegar flies
If you have problem with flies then call Duncan Ross Pest control.