Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 107
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TRANSMISSION OF TEXAS FEVER.
conveyed by the young tick, and is probably introduced by it into the
blood, was a very great stride in advance in our understanding of the
external characters of the infection.
In field IX (see Fig. 6) several natives were exposed to North Caro-
lina soil without becoming diseased.
On the station grounds field V (see Fig. 5) was infected with the blood
and spleen pulp of cattle which had succumbed to Texas fever. The
exposed natives did not become infected.
In field IV (see Fig. 5) during this same year a number of sick natives
were brought together and some healthy natives added. The latter
had a mild attack late in the season, only detected by the microscopic
examination of the blood.
These three experiments will be fully discussed farther on, and we
simply refer to them here to show that the animals not exposed under
certain conditions did not become infected although pastured not far
from Texas-fever cases during the summer.
EXPERIMENTS OF 1891.
The arrangement of the fields for this year and the uses to which
they were put are indicated on the accompanying plat. A tract of land
adjoining the station grounds on the north was added to the territory
in use. On this tract were situated a dwelling house and a number of
unused sheds. For the purpose of carrying on the various experiments,
cattle were collected near New Berne, N. C., as in previous years, and
shipped by steamer from New Berne, June 30. They arrived at the
station July 2, having been but two days on the way.
Experiment 14 (exposure to North Carolina cattle with ticks).-The
general control experiment of producing the disease in the natural way
was conducted, as before, by exposing natives to Southern animals on the
same field. For this purpose in closure VI was again selected (see Fig.
7). In this experiment not only unexposed natives but also recov-
ered natives were reiexposed to test any acquired immunity (p. 133).
Similarly Southern animals, kept for one or two years on the station,
were reixposed to determine any loss of immunity (p. 131). These
collateral experiments will be discussed in dealing with these subjects.
In this place we simply summarize the results of the exposure of fresh
natives.
The animals placed in this field comprised the following:
(a) North Carolina cattle:*
July 2-No. 172 (cow, 6 years), from farm No. 6.
Juty 2-No. 174 (cow, 3 years), from farm No. 5.
July 2-No. 177 (cow, 5 years), from farm No. 3.
July 2-No. 178 (cow, 4 years), from farm No. 2.
Eight animals were brought North, two from each farm, and divided equally be-
tween this and the following experiment.107
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Smith, Theobold & Kilborne, Fred Lucius. Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever, book, 1893; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth143538/m1/107/?q=%221863%22: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas Health Science Center Libraries.