the cause of the Havana syndrome remains a subject of ongoing investigation and speculation. The term "Havana syndrome" refers to a series of unexplained health incidents that affected U.S. and Canadian diplomats, intelligence officers, and other personnel in Cuba, as well as in other locations, starting in late 2016.
The symptoms reported by the affected individuals have included headaches, dizziness, hearing loss, memory issues, and other neurological problems. Some theories suggest that these symptoms could be the result of targeted sonic or microwave attacks, but no conclusive evidence has been presented to support these claims.
The U.S. government and other relevant authorities have conducted extensive investigations into these incidents, but the cause and source of the Havana syndrome have not been definitively determined. As the situation continues to evolve, further research and investigations may shed more light on the matter.
It's important to note that the information available to me may be outdated, and developments might have occurred since then. For the most recent and accurate information on the Havana syndrome, I recommend checking reputable news sources and official government statements.