Now with the development of technology and science, it is true the Prophet's words about the flies. Various facts have proved that flies become a cure for a disease.
Prof.DR. Amin Rida mentions that in the first 30 years of the 20th century, medicine has used flies to treat chronic ulcers and lung diseases. In addition, after a long investigation turned out to fly has a virus to kill germs. So when he brings germs from the slums, these little animals also carry the bacteria that kill the germs.