34 



larvae cause more or less fever, muscles tense, swollen, and painful 

 on movement or pressure. Trichinosis often mistaken for typhoid, 

 and muscular pains sometimes mistaken for rheumatism. 



Diagnosis — Examine suspected port for cysts. During first two 

 weeks after suspected infection examine feces for adult worms. 

 Marked eosinophilia accompanying "muscular rheumatism" may 

 be indicative of trichinosis and in such cases excision of a minute 

 piece of patient's muscle, and microscopic examination may reveal 

 cysts. 



Prophylaxis — Avoidance of imperfectly cooked pork in any form. 

 Microscopic inspection not trustworthy. Destruction of rats, 

 which seem to be the normal host of this worm. 



Family EUSTRONGYLIDAE 



Eustrongylus visceralis* — The giant strongyle, or kidney-worm 

 of the dog is the largest of nematode worms. Males may attain 

 length of 40 cm., females even 1 meter, blood red in color. Eggs pass 

 out with urine and embryo develops in presence of moisture. Further 

 development not known; has been thought to occur in fish but 

 experiments have failed to justify this view. 



Family SPIRURIDAE 

 Unimportant and not discussed in this course. 



Family FILARIIDAE 



Filaria immitis — Adults found in the right half of the heart of dogs, 

 usually causing death. Larval forms in enormous numbers in blood 

 of host. For good, up-to-date summary see Neveu-Lemaire, '12; 

 or Manson's, '07, discussion of F. bancrofti. 



Description — Adults have the general family characteristics of 

 Filariidae. Males 12-18 cm. long, tail tapering, spiral, and with two 

 lateral wings. Two unequal spicules. Females 25-30 cm. long, tail 

 short and obtuse. 



Life history — Female viviparous, larvae 290'^ long, escape into 

 blood of host whence they are taken by a mosquito. In the body 



According' to the rules of zoological nomenclature this name must be re- 

 placed by Dioctophyme renale (Goeze 1782) but in order to avoid confusion we 

 have followed Neveu-Lemaire's in the generic as well as the family name. 



