One of the very popular  diseases  in the United States, the Lyme disease is caused by a bacterium called the Borrelia Burgdorferi. The bacteria are carried by small rodents like the mice. The smaller insects like ticks carry it from the mice. The ticks need the animals like white tailed deer to reproduce. The bacteria enter the human bloodstream when these ticks bite them and cause infection. This disease can be extremely detrimental for your overall health.