tests ruled out dirt and poor sanitation as causes of yellow fever,and a mosquito was the sus-pected carrier. clara was among the group who volunteered to be bitten by the insect. she contracted the disease and died on august 24,1901.she was the only woman to participate in the experiment and among the few volunteered to die from it.with her death, the study ended,the results of the experiment provided conclusive evidence that mosquitoes were the source of the disease