This is one strange story. So someone in Cuba was using something to cause deafness in American and Canadian diplomats:
Washington (AP) — The Canadian government said Thursday that at least one Canadian diplomat in Cuba also has been treated for hearing loss following disclosures that a group of American diplomats in Havana suffered severe hearing loss that U.S. officials believe was caused by an advanced sonic device.
Global Affairs Canada spokeswoman Brianne Maxwell said Canadian 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.”