52 MANUAL OF EQUINE MEDICINE. 



very severe, and the temperature may rise to 105° or 106°, 

 or even to 107°. 



Sometimes severe pneumonic symptoms develop, when 

 large portions of one or both lungs become implicated. 

 Violent diarrhoea, colicky pains and other enteric symptoms, 

 may "supervene also. In some cases there is total loss of 

 power in the hind-quarters, and sometimes, though rarely, 

 cerebral symptoms may be manifested. 



When occurring in strong horses, pneumo-enteric fever 

 is usually a mild affection, but when attacking animals in a 

 low condition it is more serious. The more the internal 

 organs, as the lungs, intestines, and heart, are involved, so 

 much more dangerous is the malady. 



The sudden death which sometimes occurs has been at- 

 tributed to the formation of thrombi in the cavities of the 

 heart, and also to actual cardiac lesions. 



Symptoms of the Complicated Forms— 



A. Thoracic Form. — In this form the respiratory organs 

 especially, or the cardiac organs, or both, may become 

 affected, more commonly the former. Mr. Eobertson divides 

 the thoracic forms of influenza into (a) capillary bronchitis, 

 (h) capillary bronchitis with cardiac disease, and (c) pleuro- 

 pneumonia. All these forms may be detected by careful 

 auscultation, and in all the pulse is frequent and feeble, 

 and in cardiac disease of irregular rhythm. ■ 



The pneumonia of influenza is characterized by the soft 

 dull cough, acceleration of pulse, coldness of the extremities 

 and of the surface of the body. The pneumonia, being of 

 the asthenic type, may terminate in gangrene and disintegra- 

 tion of the lung-tissue. 



I B. Abdommal^Form. — This form is called 'biHqus je^er^ 

 by some, 'typhoi^ fever' by others. It is, however, in 

 reality to be'regarded as a complicated form of influenzai. 



In this variety the symptoms of gastro-enteric irritation 



