U.S. NIH studies find severe symptoms of "Havana Syndrome," but no evidence of MRI-detectable brain injury or biological abnormalities


20 Mar 2024 

Using advanced imaging techniques and in-depth clinical assessments, a research team at the National Institutes of Health (NIH) found no significant evidence of MRI-detectable brain injury, nor differences in most clinical measures compared to controls, among a group of federal employees who experienced anomalous health incidents (AHIs). These incidents, including hearing noise and experiencing head pressure followed by headache, dizziness, cognitive dysfunction and other symptoms, have been described in the news media as "Havana Syndrome" since U.S. government personnel stationed in Havana first reported the incidents. Scientists at the NIH Clinical Center conducted the research over the course of nearly five years and published their findings in two papers in JAMA today (18 March 2024).



Related information:
"U.S. Office of Director of National Intelligence published updated assessment"
(posted on 6 April 2023)

U.S. Office of the Director of National Intelligence released an executive summary of report on "Havana Syndrome"
(posted on 4 February 2022)

U.S. National Academy of Sciences published a new report which assesses illnesses among U.S. government personnel and their families at overseas embassies.
(posted on 8 December 2020)

Rapid Response Group (RRG)'s review on "An assessment of illness in U.S. government employees and their families at overseas embassies"
(posted on 23 December 2020)