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Table 2 Timeline of patient’s disease process

From: First report of a patient meeting criteria for both multisystem inflammatory syndrome in children and adult onset Still’s disease

About 4 weeks prior to presentation

Patient developed cold-like symptoms. His mother had similar symptoms, though worse in severity, and she test positive for COVID-19

About 2 weeks prior to presentation

Patient was vaccinated against COVID-19 with Pfizer/BioNTech vaccine

One week prior to presentation

Patient developed fever, headache, sore throat, nausea, vomiting, and diarrhea

About 4 days prior to presentation

Patient’s GI symptoms resolved. Patient tested negative on rapid strep and Monospot tests. Patient was prescribed amoxicillin and ondansetron

Three days prior to presentation

Patient’s PO intake decreased. He was evaluated at an outside hospital Emergency Department, and no changes were made to his management

Two days prior to presentation

Patient developed bilateral joint edema, erythema, heat, and pain in his metacarpophalanges, elbows, knees, and ankles. Additionally, he develops a rash

One day before presentation

Patient’s pediatrician evaluated patient and found elevated CRP and ESR. Patient’s pediatrician discontinued patient’s amoxicillin and recommended that patient be seen at a children’s hospital with rheumatology and infectious disease capacity

Day of presentation

Patient’s primary complaint was sore throat. His joint edema, pain, and erythema had improved, despite persistent erythema over his metacarpophalanges joints and edema bilaterally in his ankles. Patient was admitted to the hospital

One day after presentation

Patient was evaluated by rheumatology and started on IVIG, methylprednisolone, and aspirin

Three days after presentation

Patient had a negative echocardiogram. He was discharged from the hospital on a steroid taper

About 2 weeks after discharge

At follow up with rheumatology, patient had a normal joint exam and some skin peeling. He had been taking NSAIDs for relief of sore throat and joint pain that worsened with the steroid taper. At follow up with cardiology, patient had a negative echocardiogram. He continued on aspirin

About 2 months after discharge

Patient had a negative echocardiogram