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https://www.bbc.com/news/world-latin-america-49770369

Canadian researchers say they may have identified the cause of a mystery illness which plagued diplomatic staff in Cuba in 2016.

Some reports in the US suggested an "acoustic attack" caused US staff similar symptoms, sparking speculation about a secret sonic weapon.

But the Canadian team suggests that neurotoxins from mosquito fumigation are the more likely cause.

The Zika virus, carried by mosquitoes, was a major health concern at the time.

So-called "Havana syndrome" caused symptoms including headaches, blurred vision, dizziness and tinnitus.

It made international headlines when the US announced more than a dozen staff from its Cuban embassy were being treated.

Cuba denied any suggestion of "attacks", and the reports led to increased tension between the two nations.

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