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Havana syndrome has been mentioned here before. Now known as Anomalous Health Incidents, the malady has been under study in one way or another since it first appeared in 2016 among personnel stationed at the US Embassy in Havana, Cuba. At that time the headaches, vertigo and nausea afflicting these people was thought to be caused by mysterious forces directed by hostile powers. Investigations of the Havana thing and incidents in other locations didn't come up with a definitive answer but those suffering from it were made eligible for compensation.
Now, two new studies by the National Institute of Health have failed to find a cause for the syndrome. Of course that can't eliminate the possibility of nefarious behavior on the part of the country's enemies and some researchers are reluctant to accept the NIH findings. So some scientists somewhere will continue to look into this mystery.
In 2021 the Congress approved the Helping American Victims Afflicted by Neurological Attacks (HAVANA) Act that provided compensation for those affected. In the case of CIA victims it was a one-time lump sum of $187,300.
In a further development, CBS and it's news show 60 Minutes have developed contacts with Russian dissidents who have convinced them and government authorities that Russian intelligence is at the "nexus" of the problem.
Russian on-line publication Sputnik International has put together its own version of the affair. It's also a matter of interest in the on-line news source Aljazeera.