428 Veterinary Medicine. 



Death may occur in the first few days, or from exhaustion or 

 some compHcation up to the sixth, or exceptionally, the eighth 

 week. After the sixth week most cases recover, undergoing a 

 slow convalesence. 



Among sequelse may be noted : persistent muscular weakness, 

 stiffness or pain, a tendency to obesity, or loss of hair. 



During the progress of trichinosis a marked leukocytosis occurs 

 especially of the eosinophile cells. 

 -" Symptoms in Swine. When the invasion is slight, as is 

 usually the case, no symptoms are observed. The hog appears 

 to be less sensitive than man to the intestinal and muscular irrita- 

 tion caused by the trichina, and no less so to the Friedreich toxin 

 which proves so depressing to the human subject. The majority 

 of trichinous invasions of swine pass unnoticed. 



The symptoms caused by a large amount of trichinous flesh, 

 are divided into intestinal and muscular as in the human victims. 

 -^ Intestinal. In Gerlach's experimental cases the milder forms 

 showed only some slight impairment of appetite, and of vivacity, 

 drooping of the tail, and tendency to remain recumbent in the 

 litter. This may set in in three days and continue for a couple 

 of weeks, and is followed by recovery. In xaaxe. severe cases s\%-as 

 of illness appear in three to ten days, such as greatly impaired or 

 complete loss of appetite, sometimes vomiting, dulness, drooping 

 tail, constant decubitus, with the hind limbs extended, pawing or 

 shifting of the feet when the pig is raised, stiff, hesitating move- 

 ments of the hind limbs, arching of the back, tucking up of the 

 abdomen, which is tender to manipulation, diarrhoea, hyper- 

 thermia with exacerbations at night, marked thirst, grinding of 

 the teeth, pendent head, swollen conjunctiva, glassy eyes, cold- 

 ness of the skin, erection of the bristles and general weakness. 

 Death may take place during this stage, but usually in young pigs 

 or old animals in low condition and debility. 



Intestinal symptoms may last one or several weeks in different 

 cases. 



Muscular. From the eighth to the fifteenth day or even later, 

 the muscular symptoms appear. There may be an improvement 

 of appetite, or subsidence of diarrhoea, or on the other hand an 

 appearance of hyperthermia for the first time. The pig is more 

 restless than before, lying down most of the time yet often rising 



