The case concerns the government's 9/11 response, when the CIA set up a program to gather intelligence using methods later concluded to be torture.
The memo, which was sent to every CIA station around the world last week, advised agents how to keep informants alive, The New York Times reported.
The unnamed intelligence officer was suffering from serious injuries, The Wall Street Journal reported.
The CIA was enraged by WikiLeaks' publication of thousands of secret documents, a Yahoo News investigation said.
The first case of the illness was reported by US officials stationed in Cuba in 2016. More than 130 cases have emerged worldwide since.
The incident took place on a September trip to India, CNN reported. At least 130 US personnel have reported the symptoms since 2016.
Journalists were invited to wander around the ruins of the sprawling base, finding a games room one of the only buildings left intact.
"My heart aches so profoundly for these wonderful people," former CIA analyst and veteran Matt Zeller told Insider.
According to The New York Times, Afghan residents didn't know much about the base, as it was heavily fortified with walls that reached 10 feet.
Several experts have accused the Biden administration of "gaslighting the country" by trying to downplay the chaos in Kabul.
Matt Zeller also criticized the Trump administration for shutting down the SIV program and said there's "blame to go around," according to MSNBC.
It is not known what they discussed, but it "likely" involved Biden's August 31 deadline for military withdrawal, The Washington Post reported.
Is the signal the Committee wants to send that once a whistleblower conflicts with their political agenda, the whistleblower gets sacrificed?
As Nixon resigned in disgrace, 178 Americans on the other side of the world pulled off one of the most audacious intelligence operations in history.
CIA director William Burns called "Havana Syndrome," which up to 200 Americans have reported having symptoms of, "real" and "serious" during an interview.
The remote military base in the Nevada desert has a lot of history, and has been associated with aliens almost since its inception.
The number of US personnel reporting Havana Syndrome symptoms is growing. One officer described his symptoms and fight for treatment.