{"id":"chickenpox-vaccines","safety":{"commonSideEffects":[{"rate":"20-30","effect":"Injection site reactions (erythema, swelling, pain)"},{"rate":"10-15","effect":"Fever"},{"rate":"5-10","effect":"Rash"},{"rate":"5","effect":"Myalgia"}]},"_chembl":null,"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Chickenpox vaccines contain live attenuated or inactivated varicella-zoster virus that trains the adaptive immune system to recognize and respond to the pathogen. 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