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.
What is the chickenpox vaccine? The chickenpox (varicella) vaccine is a series of two shots that can protect nearly everyone who gets it from chickenpox. The first should be given at the age of 12-18 months; the second shot should be given at 4-6 years of age.