JACKSON, Wyo. (AP) — Wildlife biologists are seeing signs of an outbreak of pneumonia in a bighorn sheep herd in northwest Wyoming.

The persistent coughing that's telling of the bacteria-triggered respiratory sickness has been seen in two lambs in the Jackson Bighorn Sheep Herd that congregates in Jackson Hole.

Wyoming Game and Fish Department biologists say they are concerned.

Pneumonia is a condition caused by infectious pathogens passed along from domestic sheep.

There are no treatments to combat the malady, and research has found that culling infected animals does not work.

Wildlife managers plan to locate and euthanize the two infected lambs so their bodies can be sent to the laboratory to determine what triggered the suspected pneumonia.