The State Department has also stepped up efforts to examine the incidents that have left its personnel injured. Secretary of State Antony J. Blinken has received updates on the department’s investigation and has elevated the role of the coordinator overseeing that examination to better work with other departments, improve the response to the incidents and support injured personnel, a spokesman for the State Department said.

During the Trump administration, current and former officials expressed frustration with the government investigation. The State Department and C.I.A., they said, were not adequately sharing information. Some officials said there was tension between the two agencies.

Biden administration officials said that they had plans to fix that, and that the State Department, C.I.A., and other intelligence agencies would work better together to examine the incidents and their cause.

Gina Haspel, the former C.I.A. director, was not convinced by the evidence that Russia was responsible or that the series of incidents could be definitively classified as an attack, according to intelligence officials. But in December, Ms. Haspel formalized the work of ad hoc groups to create the task force, to re-examine earlier incidents and to collect information about new ones.

She also asked officers who thought they might have been victims but had not reported it to come forward to talk with the task force.

She also assigned the task force to help current and former officers get better treatment for injuries caused by their service with the C.I.A. Recent intelligence authorization bills based by Congress have allocated additional resources for current and former officers to receive medical treatment.

Some briefed on the new efforts said medical treatment is improving. Agency officials are now being assigned a nurse or other medical professional to help coordinate their care, including options to receive treatment at Walter Reed National Military Medical Center or other specialized facilities.

But some current and former government officials said they remained uncertain that all of the bureaucratic hurdles to getting treatment have been removed. So far, only a handful of C.I.A. officers with Havana syndrome have been treated at Walter Reed.

Mr. Polymeropoulos, the former C.I.A. officer, helped run clandestine operations in Russia and Europe and experienced what he believes was an attack in December 2017 while on a trip to Moscow for the agency. The incident immediately caused severe vertigo that later developed into debilitating headaches.

When the headaches did not end, Mr. Polymeropoulos retired. He pushed for the agency to allow him to go to Walter Reed, which the agency initially resisted. But last month, Mr. Polymeropoulos completed a treatment course for traumatic brain injury, or T.B.I., at Walter Reed.

Mr. Polymeropoulos said Mr. Burns should meet with injured officers to hear their firsthand accounts as he begins reviewing the evidence of what happened and the medical response.

“Burns will in short order need to overcome a bureaucracy that has not been kind to those that have asked for medical care,” Mr. Polymeropoulos said. “Immediately opening the pathway to Walter Reed for any officers who request treatment — as T.B.I. gets worse over time — will show a level of dedication to the work force that has been sorely lacking.”

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