Influenza is not, under ordinary circumstances, a fatal disease; the mortality has been stated by different authorities to amount to 3, 4, 9, and 10 per cent. In the outbreak which occurred in the States in 1872 the mortality among 30,000 horses was 7 per cent. The average mortality from the disease is stated to" be from 1 to 4 per cent.
The great variation in the mortality may be put down to the difference in the surroundings of the sick animal. In ordinary cases authorities allow that medicines are of little value, and careful arrangement of the diet, disinfection and ventilation of stables, and a general attention to sanitary arrangements are sufficient to combat the disease. Avoidance of exposure to climatic changes and absolute rest are essential. The disastrous effect of continuing to keep horses at work after the first indications of the disease are apparent has already been mentioned. The main object of treatment should be to uphold the strength and keep fever in check. For this purpose a dose of spirits of nitric ether in combination with aromatic spirits of ammonia, with a little nitrate of potash morning and evening, is usually sufficient.
In cases where serious complications arise, such as pneumonia, bilious fever, etc, skilled veterinary assistance must be employed.