The expert in neuropsychiatry at the University of London assessed McCluskie while he was in custody at Belmarsh Prison following his arrest.

BBC: Gemma McCluskie

"I've been working in psychiatry for 20 years and I've never seen psychotropic medications turn a child around as quickly as I've seen antibiotics turn a Pandas child around, " says Tanya Murphy, director of the Rothman Center for Pediatric Neuropsychiatry at the University of South Florida.

WSJ: Does Strep Throat Trigger Serious Ills?