{"batchcode": "PFIZER EN6208", "histograms": [{"batchcodes": ["PFIZER EL9264", "PFIZER EN6208"], "histogram": {"Dizziness": 1, "Pruritus": 1, "Rash": 1}}, {"batchcodes": ["PFIZER EN6208", "PFIZER ER8737"], "histogram": {"Arthralgia": 1, "Musculoskeletal pain": 1, "Pain": 1, "Pain in extremity": 1}}, {"batchcodes": ["PFIZER EN6208"], "histogram": {"Chills": 1, "Dizziness": 1, "Fatigue": 1, "Headache": 1, "Injection site hypoaesthesia": 1, "Muscle spasms": 1, "Muscular weakness": 1, "Nausea": 1, "Neck pain": 1, "Pain in extremity": 1, "Photopsia": 1, "Pyrexia": 1, "Vision blurred": 1}}]}