Canada will reduce its embassy staff in Cuba by up to half after another person has been affected by a mysterious illness there, authorities in Ottawa said.
Medical testing after the reappearance of unusual symptoms in November saw a 1
Canada's International Office said it would reduce its workforce by half.
The US employees are also affected by the disease, which causes dizziness, nausea and difficulty concentrating.
Canada has ignored the idea of a "sonic attack" – a theory that was previously drafted by the US State Department last year.
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A statement issued by Global Affairs Canada states that "employees, spouses, and relatives" of the Embassy were among those affected. All were treated on an ongoing basis.
While the message would remain open, some services might be affected in the future, the statement read.
The number of employees is now falling from around 16 to as many as eight, reports the Associated Press.
Canada recalled diplomatic families from Havana in April after some minors began to show the symptoms.
Every year more than a million Canadians visit Cuba, but there is no evidence that they are at risk.
Cuba has repeatedly denied its involvement. Canada says it has been working "in close cooperation" with Havana since health problems first surfaced in 2017.
Unlike the US, Canada never broke diplomatic ties with Cuba after its 1959 revolution.
Similar US embassy staff have similar symptoms in China.
A release from the US Department of State last year said that people should pay attention to "unusual, unexplained physical symptoms or events, auditory or sensory phenomena."
However, an American and a British scientist have come up with a different theory – insect noise.
Their study suggests that the tone that US employees recorded in Cuba was actually the song of India's short-cricket cricket.