Diseases are viruses that go into your bodies and attach to the cell and make you sick.  You're probably going to catch 50 out of 100 viruses in your life. Sexually Transmitted Diseases (STD) are  bad viruses that get into your body during unprotected sex.  To prevent such diseases men should were condoms during sex.  Lyme disease is transferred when a tick carried on an animal host leaves and then bites a human.  People can prevent Lyme disease by not brushing against any brush in the woods.  One of the symptoms is that your muscles start to become weak.