Reed
supposes that this individual "probably possesses a natural immunity to
yellow fever." Dr. Reed says with reference to these experiments:
It is important to note that in the three cases in which the injection
of the blood brought about an attack of yellow fever, careful culture
from the same blood, taken immediately after injection, failed to show
the presence of Sanarelli's bacillus.
Having demonstrated the fact that yellow fever is propagated by
mosquitoes, Dr. Reed and his associates have endeavored to ascertain
whether it may also be propagated, as has been commonly supposed, by
clothing, bedding, and other articles which have been in use by those
sick with this disease. With reference to the experiments made for the
solution of this question I cannot do better than to quote _in extensa_
from Dr. Reed's paper read at the Pan-American Medical Congress in
Havana.
[This extract from Dr. Reed's paper describes in careful scientific
detail the experiments which finally established the fact that the
contagion came through mosquitoes, and in no other way. Into a small
house, thoroughly air-proof, were brought bedclothes, clothing, and
other articles which had been contaminated by yellow fever patients.
Then for twenty days men who were nonimmune to the fever slept in this
building, with no evil effects.
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