{"id":"quadrivalent-influenza-virus-split-vaccine","safety":{"commonSideEffects":[{"rate":"10–30","effect":"Injection site pain, erythema, or swelling"},{"rate":"5–15","effect":"Myalgia"},{"rate":"5–10","effect":"Headache"},{"rate":"1–5","effect":"Fever"},{"rate":"5–10","effect":"Fatigue"}]},"_chembl":{"chemblId":"CHEMBL2109042","moleculeType":"Vaccine component"},"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"The quadrivalent split vaccine contains inactivated viral antigens from two influenza A strains (H1N1 and H3N2) and two influenza B strains. 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