IO2 



TROPICAL MEDICINE AND HYGIENE 



In elephantiasis, unless the patient comes from, or has 

 been living in, a district where filariasis occurs the con- 

 dition cannot possibly be attributed to F. bancrofti. Such 

 cases occur in England, but are rare. If he has resided 



FIG. 44. Development of intestine in larvae. (P. H. Bahr.) 



in a district where filaria occurs, the elephantiasis is 

 probably due to a filarial infection, past or present, even 

 if no embryo can be found in the blood. 



Etiology. The method of the introduction of the filaria 



