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.
Most live-virus vaccines, including measles-mumps-rubella vaccine, varicella vaccine, and live attenuated influenza vaccine, are contraindicated during pregnancy; the exception is yellow fever vaccine, for which pregnancy is considered a precaution by the Advisory Committee on Immunization Practices (ACIP).