Just as people can track dirt into a home on unclean shoes, “houseflies may carry on their feet millions of microorganisms that, in large enough doses, can cause disease, ” says the Encyclopædia Britannica.
فقد يلتقط الذباب العُضويات المؤذية من البراز ،‏ مثلا ،‏ وينقلها عندما يحط على طعامنا او شرابنا .‏