Everyone is familiar with house flies. The house fly can be an aggravating pest found within human homes. In fact, the house fly has a strong relationship with man and will travel with human populations to even the coldest of regions. They visit dumps, garbage heaps, decaying matter etc. House fly populations can be harmful to human health: they carry multiple pathogens and have been linked to the spread of a number of diseases. House flies are suspected of transmitting at least 65 diseases to humans.