After battling a rare ailment that threatened her track career, Richards persevered to return to action stronger than ever.

Mitchell wrote 10-chapter narrative, Genetic Disaster, describing his family's often losing battle against a rare genetic ailment and his journey to find out if he had the deadly disease.

Kawasaki disease is a very rare and mysterious ailment that strikes children under age 5.

It wasn't the rarest ailment among soldiers.

Her role, however, is to raise money for one of the 6,000 rare ailments that the National Organization for Rare Disorders says exist in the United States.

It's a rare and mysterious ailment,' he said, 'which is going around a lot at the moment.

Legionnaires' disease, a relatively rare acute respiratory ailment, is often transmitted through air blowing across water or through air-conditioning systems.

Upon his return, his vast medical knowledge and intelligence are put to the test when he is asked to help find a solution to save Kayla Brady, who was suffering from a rare biological ailment.

Just last week Senator Barbara Boxer of California pointed to the example of a child with a rare ailment that could be handled by only two specialists in the country.

And, finally, these two PBMs operate "specialty pharmacies" - pharmacies that carry drugs used for the treatment of the most rare and challenging ailments.