Secretary of State vows to keep employees better informed on "Havana Syndrome" efforts

In a letter to State Department staff, Secretary of State Antony Blinken responded to the "growing concerns" from Department employees about Unexplained Health Incidents — also called "Havana Syndrome" — which are known to have affected roughly two hundred U.S. diplomats, intelligence officers and other U.S. personnel around the world. 

"Employees going abroad are anxious about whether they or their families are at risk," Blinken wrote. "That's completely understandable, and I wish we had more answers for you." Havana Syndrome incidents were first reported by U.S. officers in Cuba in 2016. Symptoms may include vertigo, ear ringing, nausea and intense headaches; some have even been diagnosed with Traumatic Brain Injury, though physical damage to the brain hasn't always been detected.