My 4 year old nephew has measles 9 weeks ago. He is now presenting with same symptoms but much worse. Recurrence is highly unlikely. What could it be?

Must return to. child's doctor today or tomorrow. Could be a secondary bacterial infection following the Measles virus. This requires a history,physical exam, blood work , and possibly other studies. After diagnosis is made,antibiotics may be required. Push fluids and control fever. .