One of the most dangerous aspects about rat is that it feeds on our food, including ours! In the course they contaminate our food with urine and faeces. This is one of the most potent ways to transmit diseases such as leptospirosis. Rats and infections spread by them are the major construers of infamous diseases of Black Plague that caused millions of deaths in England and Europe. Rats also carry fleas and mites on their body which are also very capable of transmitting diseases and infection on human body with just one bite. Rats also bite humans which again can be a major cause of infections and diseases