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

Proposed Study Would Examine NFL Players' Health Issues

The NFL Players Association is negotiating a $100 million, 10-year study with the NFL to "diagnose, treat and prevent injuries and illnesses," in players, according to CNN.

If a deal is reached, the study would be conducted by Harvard University researchers.

"No one has ever studied these players before," Dr. Lee Nadler, dean for clinical and translational research at Harvard Medical School and co-director of the proposed study, told CNN. "There have been postmortem studies looking at the brains of previous players, but not the players today."

This study is unique in that it will look at the "whole player across his whole life, not just the brain," Nadler said.

In a statement, the NFL said it looked forward to learning more about the study, CNNreported.

"We have no higher priority than player health and safety at all levels of the game," the league said.

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Ground Beef Linked to Salmonella Outbreak: CDC

Sixteen people in five states have become ill after eating salmonella-tainted ground beef, the U.S. Centers for Disease Control and Prevention said Monday.

There have been nine reported cases of illness in Michigan, three in Wisconsin, two in Illinois and one each in Arizona and Iowa. Of the those who became sick, 53 percent have been hospitalized. There have been no deaths.

Investigators have determined that the likely cause of the outbreak is salmonella-contaminated ground beef produced by Jouni Meats, Inc. and Gab Halal Foods, the CDC said.

On Jan. 24, Jouni Meats recalled about 500 pounds of ground beef products. On Jan. 25, Gab Halal Foods recalled about 550 pounds of ground beef products.

Consumers should not eat recalled ground beef products. Instead, throw out any remaining ground beef or return it to the place of purchase, the CDC said.

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U.S. Soldier Has Double-Arm Transplant

A U.S. soldier who lost all four limbs in a bomb explosion received a double-arm transplant last month at Johns Hopkins Hospital.

The unidentified infantryman suffered his injuries in a 2009 roadside bomb attack in Iraq. Hospital officials said he is one of seven U.S. soldiers who have had successful double-arm transplants, the APreported.

On Tuesday, the soldier will join the transplant surgeons at a news conference to discuss the procedure.

An innovative treatment that used the dead donor's bone marrow cells was used to prevent the patient's body from rejecting the new limbs. The treatment has so far prevented rejection and reduce the need for anti-rejection drugs, which can cause complications such as infection and organ damage, the APreported.

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