Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

Organ Recipients Out of Danger After Completing Rabies Treatment: CDC

Three people who received organs from a rabies-infected donor in 2011 are no longer in danger of developing the deadly disease, according to the U.S. Centers for Disease Control and Prevention.

The agency said the organ recipients in Florida, Georgia and Illinois have all completed post-exposure rabies treatment and are doing well, the Associated Pressreported.

A Maryland man who received a kidney from the same Florida donor died of rabies in February.

Health officials conducted a search for any people who may have had close contact with any of the patients, and 36 people in Florida, Georgia, Illinois, Maryland and North Carolina were advised to get the rabies vaccine. So far, 28 have done so, the APreported.


H7N9 Bird Flu Virus Could be Hard to Track: Scientists

The H7N9 bird flu virus that recently killed two people and sickened five others in China could prove hard to track because it might be able to spread among poultry without causing any symptoms, scientists say.

They also noted that the virus, which previously infected only birds, appears to have mutated in a way that allows it to more easily infect other animals. This includes pigs, which could serve as hosts that spread the virus more widely among humans, the Associated Pressreported.

The findings from the scientists at several research institutions around the world are preliminary and further research is required to gain a full understanding of the H7N9 virus causing human deaths and illnesses in China.

While they try to learn more about the virus, the scientists recommended that Chinese veterinary officials conduct widespread testing of animals and birds in affected regions in order to detect and eliminate the virus before it becomes widespread, the APreported.


Okla. Dentist Should Face Criminal Charges: Dental Chief

Prosecutors should consider criminal charges against an Oklahoma oral surgeon at the center of a health scare involving thousands of patients who may be infected with hepatitis B and C or HIV, the head of the Oklahoma Board of Dentistry says.

Susan Rogers said she has talked with Tulsa County District Attorney Tim Harris about whether Dr. W. Scott Harrington is criminally liable. Harrington was a dentist for 36 years before voluntarily giving up his license on March 20.

"We're looking for the witnesses and individuals who can testify for us that this is what happened to me in (Harrington's) office," Rogers told the Associated Press.

Letters have been sent to 7,000 of Harrington's patients advising them to get tested for hepatitis B and C as well as HIV, the virus that causes AIDS. The testing is free. So far, nearly 1,000 people have been tested.

People who get tested should receive their results within two weeks, Kaitlin Snider, a spokeswoman for the Tulsa Health Department, told the AP.

Patients were urged to get tested after officials discovered improper sterilization, rusty instruments, and potentially contaminated drug vials at Harrington's two Tulsa-area offices.


New Plan Would Eradicate Polio by 2018: Health Officials

About $5.5 billion is needed for a new global plan to end most cases of polio by late next year and eradicate the disease by 2018, health officials say.

However, they acknowledge that it may be difficult to secure the funding in these tough economic times. The money is needed for vaccinations as well as the monitoring required to ensure that the paralyzing disease has been eliminated, the Associated Pressreported.

Under the plan, the long-used oral vaccine would be replaced by a more expensive but safer injection version.

Last year, there were 223 cases of polio worldwide, a historic low. This means it is an ideal time for an "endgame" strategy against polio, Dr. Rebecca Martin of the U.S. Centers for Disease Control and Prevention told the AP.


Officials Say Mandela's Health is Improving

Nelson Mandela is improving after spending nearly a week in hospital being treated for pneumonia, the South African government reported Wednesday.

The 94-year-old former president "continues to make steady improvement in hospital," said a statement released Wednesday by the office of President Jacob Zuma, The New York Timesreported. "His doctors say he continues to respond satisfactorily to treatment and is much better now than he was when he was admitted to hospital."

The statement did not say when Mandela might be discharged.

Mandela has been hospitalized three times in the past four months. That included a 19-day stay in December when he was treated for a lung infection and underwent gallstone surgery, The Timesreported.