There are many causes of thrombocytopenia. Your doctor may tell you that you have a form of the condition called immune thrombocytopenia (ITP), which is one of the most common causes of low platelets in people who do not have symptoms. You may hear it referred to by its old name, idiopathic thrombocytopenic purpura.
How the chickenpox vaccine works. The chickenpox vaccine is a live vaccine and contains a small amount of weakened varicella zoster virus. The vaccine causes your immune system to produce antibodies that will help protect against chickenpox. Read more about live vaccines. Read more about chickenpox vaccine side effects.
Live attenuated vaccines. Live vaccines are derived from âwild,â or disease-causing, virus or bacteria. These wild viruses or bacteria are attenuated, or weakened, in a laboratory, usually by repeated culturing. For example, the measles vaccine used today was isolated from a child with measles disease in 1954.ypes of vaccines. The way in which the body responds to a vaccine depends on the type of vaccine being administered. There are several different types of vaccine available and with new technology there will be further additions.