The demonstration by the United States Army commission in Cuba under Major Walter Reed of the transmissibility of yellow fever by the mosquito Aedes aegypti is a brilliant chapter in the annals of American medicine. Another pioneer contribution of the commission was the disclosure that the blood of a person afflicted with this disease carries the filtrable causative agent during the first few days of illness, whereas the sputum, feces, urine and vomitus of the patient are not infected. The last epidemic of yellow fever in the United States occurred in New Orleans in 1905. At present this dread disease little concerns the general public in this country. Despite its virtual disappearance from the United States, however, the malady continues to be interesting to the medical profession. Recently Bauer,1 of the International Health Division of the Rockefeller Foundation, has reviewed its status.
For more than twenty years the Rockefeller