Some current and former CIA officers have raised concerns that a CIA task force in charge of investigating Havana syndrome soft-pedaled its investigation, CNN has previously reported. The control group was small and not perfectly matched to those with Havana syndrome. In the second study, researchers tested hearing, balance, eyesight and neuropsychological state, and they looked at blood biomarkers, in the two groups. Headache was a common concern among the participants with Havana syndrome. The study concluded that whatever caused Havana syndrome seems to create symptoms “without persistent or detectable physiologic changes.

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Persons: David Relman, don’t, ” Relman, ’, AHIs, Relman, Trump, ”, Dr, Sanjay Gupta, ” Dr, Leighton Chan Organizations: CNN, National Institutes of Health, Stanford, CIA, AHIs, CNN Health, NIH Locations: Havana, Cuban, Bogota, Colombia, Vienna, Austria