TRICHINA. 
901 
lives. The trichinae are also found at the long insertions and 
near the extremities of the muscles. The muscles in which 
trichinae are found are classed according to the frequency of in¬ 
festations ; the diaphragm, especially its pillars ; the muscles of 
the shoulders ; the psoas muscles, and those of the caecal region ; 
* neck, tongue, cheeks, eye, and abdomen, flexors of the thigh, 
neck, intercostals, back, and the heart. 
Man is infested with trichina by eating pork which is in¬ 
fested, thereby causing trichinosis in man. The pig is infested 
by eating trichinosed animals, such as the rat, mouse, etc. The 
bodies of these small animals are very susceptible to trichinosis. 
When killed or found dead they are thrown into the manure 
pile, and the pigs feeding on the manure necessarily feed upon 
the bodies of the dead rats, etc. The rats are said to eat the 
droppings from the infested pigs and man, thereby becoming 
themselves infested with the worm. One of the great problems 
to-day is to decide which is the original host of trichina, the rat 
or the pig. It has been found in the black rat and the pig all 
over the world. It is believed to have been brought into this 
country by the rats getting into the ships, thus crossing the 
ocean, in that way or manner getting into the United States. 
There are more trichinae found in the pig than in any other 
animal, and consequently the symptoms will apply more to the 
pig than any other particular animal. Some animals are very 
often passed over when they have a small infestation, being 
noticed only when a number of trichinae are infested. The first 
symptoms are those related to the intestinal trichinosis: De¬ 
pression of the head, thirstiness, fever, dullness, grinding of the 
teeth, more or less inappetence for food, and a glassy appearance 
of the eye. The abdomen is retracted and very painful upon 
pressure, arching of the back, and lastly a very severe case of 
diarrhoea, which lasts the pig some time. These are only the 
minor symptoms, which last for a month or more. These are 
similar to the symptoms of some other well-known diseases, as 
enteritis, rheumatism, etc. Muscular trichinosis appears from 
the ioth to the 15th day; the symptoms are: The appetite be- 
