Scientists are no closer to finding the cause of ‘Havana syndrome’ after a study did not reveal any evidence of brain injuries or abnormalities in those affected.
The mysterious syndrome first appeared in 2016, when US and Canadian embassy staff in Havana experienced an array of unusual, unexplained health problems.
These included ringing in their ears, nausea, dizziness and loss of balance, issues with memory and concentration, light and sound sensitivities and irritability, alongside a sensation of intense pressure or vibration in their head, described as nomalous health incidents (AHIs).
The latter in particular led to speculation they had been hit by a microwave weapon or directed-energy device, but this has never been proved.
However, cases of Havana syndrome have continued to plague US government employees.
As scientists grapple with trying to explain these sudden sensations, a team of researchers at the National Institutes of Health (NIH) conducted a series of tests to see if they could …