State Department spokeswoman Heather Nauert also said at the time that the Chinese government assured the State Department that it is investigating the symptoms felt by the US government employee.
Sunday's foreign ministry statement termed those actions politically motivated, pointing out that "after more than a year of investigations by Cuba and the United States. there are no credible hypotheses nor scientific conclusions that justify the actions taken by the USA government against Cuba". It urged them "not to attempt to locate the source of any unidentified auditory sensation".
The alert comes as a USA medical team is screening more Americans who work at the Guangzhou consulate. But President Donald Trump and other US officials have accused Cuba of having targeted USA personnel with some kind of "acoustic sonic weapon" for unknown reasons, an allegation the Cuban government has forcefully denied.
USA experts have yet to determine who or what was behind the mysterious illnesses that affected 24 people.
Cuba has denied targeting embassy staff, and the U.S. has not blamed the country's government for the suspected attacks.
China has said it had looked into the Guangzhou case but came up with no clues about the cause of the symptoms. "The Ministry of Foreign Relations reiterates that no evidence of the alleged incidents has been presented, and maintains its unwavering commitment to cooperate with USA authorities".
The Penn team said the patients from Cuba experienced persistent disability though rehabilitation therapy customized for them seemed to help.
US has recalled two members of a diplomatic mission in Cuba to survey for possible traumatic brain injury, told The Associated Press from three us official.
Canada in April also ordered families of diplomatic staff in Cuba to return home after mysterious health symptoms were detected in 10 Canadians stationed on the island.
The incidents have raised concerns that a government or agency may be targeting the U.S. with a new type of sonic weapon.
USA personnel in Havana began reporting the incidents in 2016, and they were first disclosed publicly previous year.
It serves four southern provinces with a combined population of more than 204 million and processes more than 1 million visa applications of all types annually.
The administration of U.S. President Donald Trump, which has partly rolled back a detente with Cuba, first charged diplomats were the victims of "sonic attacks" and Cuba as the host country was at a minimum responsible for their safety.
Aled Williams, a British teacher at a kindergarten said Thursday that the reports sounded "sci-fi-ish".
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