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.