Another U.S. intelligence official has come down with Havana Syndrome symptoms. What are they?

Another U.S. intelligence officer has been struck by Havana Syndrome symptoms, angering CIA director William Burns and resurfacing a conversation about the mysterious illness. 

Experts are in the process of verifying the officer's symptoms, which are consistent with the scores of other cases in recent years linked to Havana Syndrome, according to James Giordano, a scientist briefed on the case and others.

The officer was traveling with Burns through India this month, and an investigation is ongoing. CNN first reported the incident. There are questions about if the officer was targeted because he was traveling...