ASSOCIATED PRESS Biologists hope they've isolated the germ leading to the deaths of thousands of bighorns BOISE, Idaho -- Biologists at Washington State University say they have isolated a bacterium that may have contributed to the deaths of thousands of bighorn sheep in the West in the past five decades. The biologists say they found mycoplasma ovipneumoniae in tissue taken from dying lambs captured in Hells Canyon -- a chasm that borders Idaho, Oregon and Washington. They say it inhibits the ability of hairlike structures in the sheep's airways to eliminate bacteria that lead to pneumonia -- a leading cause...