The New York Times identified the latest American employee evacuated as Mark A. Lenzi, a security engineering officer at the consulate who left Wednesday night with his wife and two children.
"The State Department received medical confirmation that a USA government employee in China suffered a medical incident consistent with what other US government personnel experienced in Havana, Cuba", it said in an emailed statement. It is also the only US diplomatic installation in China authorized to process immigrant visas and handle adoptions.
Doctors said in February that the symptoms among some 24 Havana embassy staffers were similar to those caused by concussions - headaches, balance problems, sleep disturbances and visual and hearing difficulties.
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Cuba released details Sunday on the latest mysterious health incident involving a US diplomat in the country, saying that Cuban officials learned of the episode late last month when the USA said that an embassy official felt ill after hearing "undefined sounds" in her home in Havana. There is a USA medical team in Guangzhou assessing whether more people need to leave China, the Associated Press reported.
Twenty-one U.S. diplomats in Cuba were affected last August by sonic attacks with an acoustic device, according to the State Department.
In 2017 in Cuba at least 22 American diplomat and their family members have suffered as a result of the mysterious "acoustic attack".
China has said it had looked into the Guangzhou case but came up with no clues about the cause of the symptoms.
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Keep firearms and drugs out of the hands of those at risk are common sense, unless you don't know half of suicides were at risk. If you or someone you know may be contemplating suicide, call the National Suicide Prevention Lifeline at 1-800-273-8255.
The incidents have raised concerns that a government or agency may be targeting the U.S. with a new type of sonic weapon.
The symptoms are similar to those exhibited by US personnel in Cuba after they heard odd noises in an apparent sonic attack. The consulate opened months after the establishment of diplomatic relations between Beijing and Washington in 1979 and moved to its new purpose-built facility in 2013.
Linda Chen, who runs a coffee shop in the area, said she was mystified as to why only certain people seemed to have been affected in an area known for its comfort and safety.
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Suicide by asphyxiation or suffocation was the second most common cause of death during that time period. Only six states - Idaho, Kansas, North Dakota, South Dakota, Vermont, and Utah - had larger increases.