Cause.—Due to worm or parasite called Strongylus Micrurus, a small thread-like worm two to four inches in length, found in the bronchial tubes, a portion of the lungs. The life history of this parasite is not known, but infection is apparently derived through the medium of pastures where infested cattle have grazed. Young cattle are more seriously affected than old animals. These parasites are especially common in low marshy pastures.

Symptoms.—This form of bronchitis usually affects the entire herd; the animals become poor, unthrifty, hacking, coughing, especially at night, and sometimes animals actually cough up worms.

Treatment.—Various treatments have been recommended for Verminous Bronchitis, or Lung Worm, as injecting Turpentine into the windpipe or fumigating animals by placing them in a closed shed or barn and burning sulphur, compelling the affected animals to inhale the fumes. This treatment perhaps is the safest and the most effective. A person should remain in the enclosed shed and when the fumes become so strong that there is danger of suffocation, open the doors and windows. This treatment should be repeated every week until coughing ceases.