After months of rumors, doctors have published the first detailed report describing the mysterious illness that struck US diplomats stationed in Cuba. While the source of the illness is still a mystery, the doctors say they’re “pretty certain” it wasn’t a sonic weapon.

Doctors examined 21 people associated with the US embassy in Cuba, and found that their symptoms resembled those caused by brain injuries — including headaches, sleep disturbances, and mood changes. But surprisingly, none of the diplomats showed any obvious signs of head trauma, according to a paper published today in the Journal of the American Medical Association.

“This is really concussion without concussion,” says study co-author Douglas Smith, director of the…

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