In the alert, the US government urged its citizens in China to seek medical help in the event they suffered any "unusual, unexplained physical symptoms or events, auditory or sensory phenomena, or other health concerns".
A US official, who wasn't authorized to discuss the situation publicly and requested anonymity, said the evacuated American government workers were being brought from China for testing to the University of Pennsylvania.
US officials have suggested that Russian Federation was involved in the targeting of the diplomats in Cuba, and possibly also in Guangzhou, perhaps with the tacit knowledge of the Chinese.
The New York Times identified the latest American employee evacuated from China as Mark A. Lenzi, a security engineering officer who left Wednesday night with his wife and two children. The staffer had reported hearing and feeling "abnormal" sounds and pressure. He's also calling on several top State Department officials to resign: accusing them of a cover up.
A USA medical team has been screening more personnel and their family members who work in Guangzhou this week in order to determine who may have been affected.
China says it has uncovered no information that could point to a cause.
While symptoms the diplomats and their family members experienced in Cuba varied, in all 24 medically confirmed cases victims have described some combination of the following: "sharp ear pain, boring headaches, ringing in one ear, vertigo, visual focusing issues, disorientation, nausea, and extreme fatigue". That is the place docs have been treating and finding out sufferers beforehand evacuated from the U.S. Embassy in Havana.
On Tuesday, Secretary of State Mike Pompeo announced the launch of The Health Incidents Response Task Force, which had been created to respond to the unexplained ailments, including testing workers and families at the Guangzhou consulate.
The U.S. retaliated by expelling Cuban diplomats.
Nauert on Wednesday reiterated that the "safety and security of USA personnel and their families is our top priority".
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A US medical team is screening more Americans who work in a southern Chinese city as the State Department confirmed evacuating a number of government workers who experienced unexplained health issues like those that have hurt USA personnel in Cuba.
The alert urges United States citizens across China to seek medical help if they experience any "unusual, unexplained physical symptoms or events, auditory or sensory phenomena, or other health concerns".
President Trump, Tillerson, and State Department officials have said they believe the Cuban government knows what occurred and who is responsible.
The China incidents affect one of the most important of the seven US diplomatic outposts in the country.
The U.S. requested Chinese assistance in its investigation, but on Thursday, a Chinese Foreign Ministry spokesperson said China had conducted a thorough investigation of its own, and found nothing.
A similar situation led the U.S. to recall non-essential embassy staff from Cuba in 2017 , after at least 24 United States citizens suffered symptoms, leading to suspicions that they had been deliberately and covertly targeted. Cuba does not have an adversarial relationship with Canada, but Ottawa and Moscow have recently clashed over Canadian sanctions.
As early as November 2016, some diplomats stationed in Havana said they heard unusual noises in their homes that were accompanied by the onset of symptoms.
A study earlier this year outlined the extensiveness of the problem, but the State Department has not pointed to a specific cause behind the mysterious incidents.
Nauert again stressed that the department was taking the incident "very seriously and working to determine the cause and impact of the incident".
Screening has also been offered to employees at the country's embassy in Beijing and other U.S. consulates on request.
"The Chinese government has assured us they are also investigating and taking appropriate measures", she said.