Dr. Paul Andrews traveled to Cuba to investigate after learning of the first cases of the mystery illness. He wasn’t too worried for his own safety, at first.

CIA physician Dr. Paul Andrews was one of the first people sent to Havana, Cuba, to investigate a spate of mysterious health incidents that were impacting embassy and agency personnel in 2017 when he was struck by the same set of debilitating symptoms, he told CNN Chief Medical Correspondent Dr. Sanjay Gupta in his first public interview for a CNN Special Report: “Immaculate Concussion: The Truth About Havana Syndrome.”