The driver, a 42-year-old female ambulance technician, and the patient, an 88-year-old man, were pronounced dead at the scene.
A male crew member and a male relative of the patient remain in hospital both in a serious condition.
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The crash, which killed three people on the M40, has been referred to the police watchdog. I
Tim Mason had flu-like symptoms and told doctors he "felt like he was dying" but was discharged without further treatment, an inquest heard.