THE PHILIPPINE 



Journal of Science 



B. The Philippine Journal of 

 Tropical Medicine 



Vol. VII DECEMBER, 1912 No. 6 



THE R6LE OF STOMOXYS CALCITRANS IN THE TRANSMISSION 

 OF TRYPANOSOMA EVANSI.^ 



By Maurice Bruin Mitzmain. 

 {From the Veterinary Division,'' Bureau of Agriculture, Manila, P. I.) 



This paper is one of a series of studies undertaken to incrim- 

 inate, or to exclude from future practical consideration, the 

 various species of bloodsucking insects that might be concerned 

 in the transmission of surra. It is planned to duplicate these 

 methods of experimentation, if practicable, with each species 

 of ectoparasite of the draft animals of the Philippines. It was 

 believed that this investigation could be made more valuable, 

 and a more practical insight obtained into the problem of the 

 epidemiology of surra, by such an intimate study of each species 

 at close range, than by attempting a more or less hasty survey 

 under field conditions of the several species of flies implicated 

 in natural outbreaks of the disease. 



Bagshawe, editor of the Sleeping Sickness Bureau Bulletin, 

 has written in this connection as follows: 



It appears that an epidemic of surra may be started from an animal in 

 which trypanosomes are very scarce. If it were known that one species 

 of insect alone is capable of becoming infected from such an animal and 

 that flies of this species transmit infection to other animals for a period 

 of many weeks, such knowledge could not fail to lead to precision and hence 

 economy in preventive methods. 



In most of the literature concerning Stomoxys and the trans- 

 mission of trypanosomiasis, the species of the insect carrier has 

 not been determined. This can be pardoned when one realizes 

 that the work has rarely been performed by entomologists, but 



1 To be published as Bulletin No. 24, Bureau of Agriculture of the 

 Government of the Philippine Islands. 

 ' Archibald R. Ward, chief. 



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