At an August 10 State Department press briefing, the Spokesperson Heather Nauert discussed the ongoing U.S.-Cuba diplomatic dispute about U.S. diplomats in Cuba who have had medical problems.
Emphasizing that there was an ongoing U.S. investigation of this matter, she said that the U.S. was still trying to determine the cause of the ailments, that it was too soon to blame any government or other person for the problems, that she has no knowledge of a country other than Cuba being the potential cause of the problems and that she was not aware of the U.S. having experienced the same problem in other countries.
She also said that the two Cuban diplomats in the U.S. had been expelled in May because Cuba had breached its obligation under the Vienna Convention on Diplomatic Relations, whose Article 29 states: “The person of a diplomatic agent shall be inviolable. He shall not be liable to any form of arrest or detention. The receiving State [here, Cuba] shall treat him with due respect and shall take all appropriate steps to prevent any attack on his person, freedom or dignity.” (Emphasis added.)
There have been reports that at least one Canadian diplomat has been treated in hospital in Cuba afar suffering headaches and hearing loss and that the Canadian and Cuban governments are investigating the problem. Global Affairs Canada spokeswoman Brianne Maxwell said Thursday that agency officials “are aware of unusual symptoms affecting Canadian and US diplomatic personnel and their families in Havana. The government is actively working — including with US and Cuban authorities – to ascertain the cause.” U.S. State Department spokesperson Heather Nauert could neither confirm nor deny such reports.
Ms. Nauert also asserted that the U.S. Embassy in Havana is fully staffed and operational.
 Canadian diplomat in Cuba treated for hearing loss, CBCnews (Aug. 10, 2017); Assoc. Press, Canadian Diplomat in Cuba Treated for Hearing Loss, N.Y. Times (Aug. 10, 2017).