The Rice belt journal. (Welsh, Calcasieu Parish, La.) 1900-19??, 1905-08-11
Of blood is was purposely applied to
non-immunes in camp.

non-immuneS IN camp.
I'm December fgS cases OF Tie dis
ease were developed as the result OF
such applications, in January three
and in February two, making in all
ten, exclusive Of the eases Of Drs, Car
roll and Lazear. Immediately upon
the appearance Of the first recognized
symptoms of the disease. in any one Of
these experimental cases. the patient
was taken from Camp Lazear to a vel
low fever hospital, one mile distant.
Every person in camp was rigidIy pro-
ptected from accidental mosquito bites.
and not in single instance did yellow
fever develop in camp except at the
will of the eXperimenters. The eXper-
lmentS were conducted at a season
when there was the least chance of
naturally acquiring the disease and
the mosquitoes used were kept active
by maintaining them at a summer TEN.
perature.
"a complete mOsquito-prOOf build
ing was divided into two compartments
by wire screen partition: infected in
sects were liberated on one side only.
A brave non-immune entered and re
manned long enough to allow himself
to be bitten several times. lie was at
tackled by yellow fever, while two sus-
ceptible men in the other compartment
did not acquire the disease, although
sleeping there thirteen nights. This
demonstrated in the simplest and most
certain MANNER that the infectiousness
of the building was due only to the
presence of the insects.
Every attempt was made TO infect
individuals by means of bedding,
clothes, and other articles that lad
been used and soiled by patients suf-
fering with virulent yellow fever"
DIR. CAROLS CONVINCING REPORT.
Naturally yellow fever is transmit
ted by the mosquito, and always and
only by the mosquito. The harmless
ness OF fomites has been fully demon
strated by our experiments in 1900 AMI
1901, in which three young Americans
slept for twenty consecutive nights in
room from which mosquitoes we're
excluded garnished with articles soiled
with discharges from fatal and other
cases of yellow fever. Three and four
large boxes were packed and unpacked
each morning by these non-immunes,
who suffered no disturbance of health
from these exposures. The room was
twenty feet by fourteen feet, double
walled, tightly cealed, heated to above
80 degrees Fahrenheit and dark.
1.-TWO other non-immunes then occu-
pied the room for twenty nights, while
additional articles of bedding and
clothing were added. They slept in
the garments and between the sheets
that had covered cases Of yellow fever,
some of which were fatal. The result
Of the second attempt was nil. A third
attempt was then made with two ad-
ditiOnal nOn-immunes, equally without
success. Not the slightest indisposi-
ton followed close and intimate con-
tact with the repulsive material in any
case Temperatures and pulse rates
were recorded at regular and frequent
intervals. Four of these seven non
immunes were subsequently infected
by blood-injections and by means of
infected mosquitoes.
Another kind of experiment was IN |
cluded in the Cuban investigations |
Of yellow fever. A room was prepared |
SO as to preclude the possibility of in
lection by formites infected articles). |
Every article contained in the room
had been previously disinfected and |
was thoroughly clean. The only pos
concluded on Page Four,