ADELAIDE, Australia: Sam the koala, who gained worldwide fame and sympathy when she was rescued during Australia's devastating wildfires this year, was euthanized yesterday after a veterinarian found the cysts that threatened her life were inoperable.

The 4-year-old koala had developed the cysts associated with urogenital chlamydiosis, which affects more than 50 percent of Australia's koala population.

During surgery, the disease was found to be so advanced that it was inoperable and Sam was euthanized, said Peita Elkhorne of TressCox law firm, which represents the shelter where the koala had lived since the February fires.