CHAPTER XXV 



THE EELATIOX OF FLIES TO MYIASIS AND TO THE 

 SPREAD OF INTESTINAL WORMS 



Myiasis, 



The occurrence of the larvae or maggots of flies of different 

 species in the human body, where they most commonly are found 

 in the intestinal tract and less frequently in the urinary passages, 

 usually leads to a diseased condition to which the term Myiasis is 

 applied. For many years cases of mpasis have been recorded 

 and references to such cases are widely scattered through medical 

 and scientific literature. In a large number of instances, especially 

 in the cases of the earlier records, the identity of the species 

 of larva was not determined and in fact, until recently, the 

 determination of dipterous larvae was a matter of considerable 

 difficulty owing to our lack of knowledge of the developmental 

 histories of even the commoner species. 



In a recent brief review of our knowledge (1912) I have 

 collected a number of the more important and typical cases of 

 myiasis of the intestinal and urinary tracts. Austen (1912) has 

 also recorded in a very complete and excellent account instances 

 of British flies which have been found in cases of myiasis in man, 

 to which account I am indebted for many of the cases to which 

 reference will be made. 



The species whose larvae have been recorded as causing 

 myiasis in man are as follows: 



The House-fly, Musca domestica. 



The Lesser House-fly, Fannia canicularis. 



The Latrine fly, Fannia scalaris. 



