426 Veterinary Medicine. 



All unsuspected source of the parasite is found in infested sau- 

 sage cases. The contents of the sausage may have been thor- 

 oughly examined and proved, but the presence of trichina, as 

 wandering embryos or encysted larvae, in the intestinal walls will 

 render the sausage infecting. As many persons eat sausage raw 

 or nearly so the danger from this source is a very real one. 



Trichinosis in man is much more common in Germany than in 

 America, chiefly on account of the German habit of eating raw 

 or underdone sausages and pork. The infrequent victims in 

 America are very often members of German families. The 

 American who persistently declines rare meat, e-specially pork, 

 escapes. 



Statistics seem to show that, in spite of the density of the pop- 

 ulation which is favorable to propagation, the percentage of tri- 

 chinous pigs in Europe, is lower than in America. The following 

 ratios are given by Neumann : In Holland, Sweden, Denmark 

 and Rus-sia 12:1000; in Prussia 0.54:1000 ; in Posen 5.18:1000 ; 

 in Shroda 14.75:1000 ; in Germany as a whole o.i to 0.13:1000. 

 It is largely concentrated in given localities, but the statistics 

 are also largely affected by the relative care in microscopic 

 examination in different places. 



Symptoms. In all animals trichinosis is manifested by two 

 stages, corresponding to the successive habitats of the worms, in 

 the intestines, and in the muscular and other tissues, respectively . 

 The first stage corresponds to the first ten to fifteen days after 

 the ingestion of the trichinous flesh, and the second to the tenth or 

 fifteenth day on to the fortieth. The .symptoms are usually more 

 violent in man than in the pig, though this does not apply to 

 many of the smaller animals infected experimentally. 



Symptoms in Man. The intestinal symptoms begin on the 

 second or third day after the ingestion of the trichinous flesh, or 

 as soon as the worms set free by the digestion of their capsules 

 have undergone material development and attained sexual ma- 

 turity. There are general abdominal tenderness, colicy pains, 

 inappetence, nausea, vomiting and diarrhoea, sometimes mixed 

 with blood. In some instances this is followed by an obstinate 

 constipation, probably owing to the inflammation of the intestinal 

 walls. Collapse and death may follow at this early stage. 



About this time, and often before the migration into the muscles, 

 there is usually a sense of great weariness and muscular fatigue, 



