3o8 



DISEASES DUE TO HELMINTHS 



The cyst resists a temperature of 8o°C. or smoking, pickling and 

 freezing. 



The adult worm has an anterior part thin and whip-like, the 



.V' 



r- 



M 



.^^^^ MKi^- 



! \'i 



v.^S*' 



^ Vaiious phases of the calcification of Tri- 



i chinella of the muscles, which starts at the poles 



/- 1 c J T- ■ u- 1 ■ V 1 "f i'^^ capsule. 



Calcified Trichintlia m ihe muscular ' 



system of a pig ; the capsu'es are not 



calcified. (After Osterlag.) 



posterior is thick and carries the genitalia, but there is not the abrupt 

 transition as in the Trichocephalus. 



There are two cone-like appendages. The female vulva is placed 

 far forwards. 



This worm is really a parasite of the black rat (Kpimys rattus) and 

 the sewer rat (Epimys norvegicus). 



SYMPTOMATOLOGY. 



There are : irregular fever not unlike typhoid ai times, some general 

 abdominal pain and tenderness with agonizing pains as the larva? 

 burrow through the muscle, which pain lasts intermittently for from 

 five to seven weeks. When the muscles of respiration, mastication or 

 deglutition are invaded the essential functions are rendered difificult. 



When the female has finished depositing embryos and all have 

 become encysted the symptoms clear up. 



The eosinophilia is verv high. The larvie are not found in the 

 blood. 



There is often diarrhoea, raised temperature and oedematous 

 swellings. 



Fatal peritonitis may occur in a heavy infection. 



TREATMENT. 



Anthelmintics are useless. 

 The treatment is symptomatic. 



