In a statement released Wednesday, Global Affairs Canada (GAC) said "up to half the number of Canadian staff posted to Havana", would be removed. USA diplomats in Cuba have also developed a similar illness and reduced their staff in the country.
Cuban officials have offered their full cooperation in investigating the mysterious illness since the first cases surfaced in the spring of 2017, officials said.
Canadian officials have stated that Cuba is cooperating with their ongoing investigation. The remaining staff would provide full consular services, but some non-essential programs will be reviewed and potentially phased out in the coming weeks, Canadian officials said.
This latest case involves a diplomat who arrived in the summer and who reported symptoms on December 29 of a mysterious illness that causes problems including nausea, dizziness, headaches and trouble concentrating.
The department said 14 Canadian employees, spouses and dependents have exhibited mysterious symptoms, including headaches, dizziness, nausea and difficulty concentrating. She said the reduction also would help "those who in the United States use this issue to attack and denigrate Cuba".
Cuba remains committed to maintaining good bilateral relations with Canada despite its decision on Wednesday, she wrote. It follows the return of spouses and children past year.
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Vidal said there was no "evidence that might reveal any brain damage, or that may explain the varied symptoms reported, or that may indicate that these symptoms had occurred due to the stay of the affected diplomats in Cuba".
Canada is also among Cuba's 10 top trading partners, with Canada-Cuba trade totaling $790 million in 2017.
Kimberly Breier, the current U.S. assistant secretary of state for the region, noted the latest confirmed Canadian injury in a tweet.
In response to the study, a State Department spokesperson told CNN that an investigation "involving medical, scientific, and technical experts across the U.S. government and academia" was underway.
"Tests confirm that an additional employee has symptoms consistent with those of previously affected employees", the foreign ministry said in a statement, adding that no cause had been identified.
It's the latest development in an global mystery that has seen Canadian and US diplomats in Havana hit with concussion-like symptoms, and which has left governments scrambling to find answers in what's being called "unprecedented and very hard incidents".