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Doctors knew the donor had encephalitis, an inflammation of the brain, when they harvested the organs. However, they didn't know rabies was the cause.

In this most recent case, the donor was experiencing "changes in mental status" before he died, according to Dr. Matthew Kuehnert, director of the CDC's Office of Blood, Organ, and Other Tissue Safety. He said doctors in Florida tested the donor for various causes of encephalitis, including West Nile Virus and herpes, but did not test for rabies.

Hospitals do test for other causes of encephalitis, and if no cause is found, the organs are donated.

“It does not protect as promoted. It’s all a sales job: it’s all public relations.”

“I say, ‘Use this vaccine,’ ” he said. “The safety profile is actually quite good. But we have oversold it. Use it — but just know it’s not going to work nearly as well as everyone says.”

“Does it work as well as the measles vaccine? No, and it’s not likely to. But the vaccine works,” Dr. Joseph Bresee, chief of epidemiology and prevention in the C.D.C.’s influenza division, said. And research is advancing to improve the effectiveness of the vaccine.

“We have overpromoted and overhyped this vaccine,” said Michael T. Osterholm, director of the Center for Infectious Disease Research and Policy, as well as its Center of Excellence for Influenza Research and Surveillance. “It does not protect as promoted. It’s all a sales job: it’s all public relations.”

He still considers himself a “a pro-vaccine guy,” Dr. Osterholm said.

“I say, ‘Use this vaccine,’ ” he said. “The safety profile is actually quite good. But we have oversold it. Use it — but just know it’s not going to work nearly as well as everyone says.”