STEGOMYIA FASCIATA. 



713 



was such that he could not possibly have produced 

 experimental fever, and that the development of 

 the disease in his subjects was purely a coincidence. 

 The reason for this will appear below. 



Having satisfied themselves that Bacillus icte- The work of 

 roides is but an accidental organism in yellow Etc.? with 011 ' 

 fever, and that it is found under normal condi- l^sS^J^a!* 

 tions as well, Reed and his associates began work 

 on the mosquito hypothesis of Finlay. The first 

 positive result was obtained in the case of Dr. Car- 

 roll. Carroll "was bitten at 2 p. m., Aug. 27, 1900, 

 by Stegomyia fasciata. This particular mosquito 

 had bitten a severe case of yellow fever on the 

 second day of the disease, twelve days before; a 

 mild case of yellow fever on the first day of the 

 attack, six days preceding; a severe case of yellow 

 fever on the second day of the attack, four days 

 before; a mild case of yellow fever on the second 

 day of attack, two days before inoculation." After 

 an incubation period of three days, Carroll devel- 

 oped typical and severe yellow fever, from which 

 he recovered. A similar result in one other case 

 was reported at this time, and later Camp Lazear, 

 with mosquito-proof houses, was established for the 

 continuation of the study. The experiments of 

 Reed and his co-workers, and confirmatory work by 

 G-uiteras and the French commission, can not "be 

 described in this place. We may feel sure, how- 

 ever, that with all the conditions of experimenta- important 



,. , , , , ,, ,, f . , Facts Which 



tion under absolute control the following points 

 have been determined with scientific certainty: 1. 

 Yellow fever may be transferred from a patient to 

 a non-immune by the bite of a mosquito Stego- 

 myia fasciata which has previously fed on a 

 yellow-fever patient. 2. In order that the mos- 



Have Been 

 Learned. 



