Common Diseases of Farm Animals by D. V. M. R. A. Craig
page 307 of 328 (93%)
page 307 of 328 (93%)
![]() | ![]() |
|
_The specific cause_, _Streptococcus equi_ (Fig. 113), was discovered by
Schutz in 1888. Strangles is commonly spread by exposing susceptible animals to diseased animals, either by direct contact, or by exposing them to the infection in the stable and allowing them to drink or eat food from watering and feeding troughs on premises where the disease exists. The predisposing causes are cold and sudden changes in the weather. For this reason the disease is most prevalent during the late winter and early spring. [Illustration: FIG. 113.--Streptococcus of strangles.] _The period of incubation varies_, usually from four to eight days. _The symptoms_ at the beginning of the attack are a feverish condition and partial loss of appetite. The visible mucous membranes are red and dry. This is followed by watery nasal secretions that become heavy and purulent within a few days. The inflammation may extend to the larynx and pharynx. The glands in the region of the jaw become hot, swollen and painful, and the animal may be unable to eat or drink. The swelling and inflammation of the throat, and the heavy, pus-like secretions that accumulate in the nasal cavities, cause difficult respirations. After a few days the abscesses usually break, and the symptoms are less severe. If the abscesses break on the inside of the throat, the discharge from the nostrils is increased. The disease may be accompanied by an eruption of nodules, or vesicles on the skin, or nasal mucous membrane. In severe and chronic cases multiple abscesses may form. This complication is indicated by emaciation and weakness. Such cases usually terminate in |
|