" Some of these volunteers were enlisted men of
the United States Army and some were Spanish immigrants who had recently
arrived in Cuba. When taken sick they received the best possible care,
and after their recovery they had the advantage of being "immunes" who
had nothing further to fear from the disease which has caused the death
of thousands and tens of thousands of Spanish soldiers and immigrants
who have come to Cuba under the orders of their government or to seek
their fortunes.
The experiments already referred to show in the most conclusive manner
that the blood of yellow fever patients contains the infectious agent,
or germ, to which the disease is due, and this has been further
demonstrated by direct inoculations from man to man. This experiment was
made by Dr. Reed at "Camp Lazear" upon four individuals, who freely
consented to it; and in three of the four a typical attack of yellow
fever resulted from the blood injection. The blood was taken from a vein
at the bend of the elbow on the first or second day of sickness and was
injected subcutaneously into the four nonimmune individuals, the amount
being in one positive case 2 cc, in one 1.5 cc, and in one O.5 cc. In
the case attended with a negative result, a Spanish immigrant, a
mosquito inoculation also proved to be without effect, and Dr.
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