A 20-year-old Air Force recruit who died of rabies had symptoms of the disease but wasn’t tested before his organs were transplanted to four patients, one of whom died of rabies nearly 18 months later, federal health officials said Friday.

The three other organ recipients are getting rabies shots and haven’t displayed any symptoms. Doctors at the Centers for Disease Control and Prevention declined to speculate on their chances for survival.

“This case is so unique and atypical that we cannot make predictions,” said Richard Franka, acting leader of the CDC’s rabies team.