Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 130
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[MMUNITY AND PROTECTIVE INOCULATION.-DISTRIBUTION
OF DISEASES RESEMBLING TEXAS FEVER ON OTHER CONTI-
NENTS.
IMMUNITY IN SOUTHERN CATTLE.
It has been stated by some observers that Southern cattle soon lose
their immunity against Texas fever after they have been taken to
Northern pastures, and that they are liable to be attacked by this dis-
ease after having been away from the permanently infected territory
for a year or longer. These statements, so far as we know, are not
based upon experimental evidence, but upon observation of natural
outbreaks, and hence the evidence is hkely to be weak in one or more
points. As we were more or less favorably situated to test these state-
ments, some of the Southern animals were kept on the station grounds
for one or two winters and then reixposed to freshly imported Southern
animals together with Northern stock. These experiments are a part
of those already described in connection with ticks, and the following
numbers, therefore, belong to the original experiments.
Experiment 8 (exposure of native to Texan cattle, page 100).-In addi-
tion to the natives, a Southern animal (No. 62), brought from North
Carolina in 1889, was exposed on this field September 25, 1890, with a
native (No. 74). The latter died October 16, while the Southern animal
appeared not to be affected. The blood was examined three times.
The corpuscles did not fall below five and one-half millions. All adult
natives exposed in this inclosure during the summer succumbed to
Texas fever.
Experiment 9 (exposure of natives to North Carolina cattle, page 100).--
In addition to the natives placed in this inclosure, the following North
Carolina cattle of the previous year were introduced July 4,1890:
No. 32 (heifer, 3 years). Exposure negative.
No. 59 (cow, 5 years). Exposure negative.
No. 87 (calf of No. 59, 31 months). Slight infection.
No. 61 (steer, 2 years). Exposure negative.
No. 67 (cow, 5 years). Exposure negative.
No. 86 (calf of No. 67, 2 months). Slight infection.
From this table it will be seen in the first place that none of the cat-
tle died or became visibly diseased. In Nos. 32 and 59 the blood was
examined September 3, when all exposed natives were either sick or
dead, and found normal. Nos. 61 and 67 were not examined in this
way. In case of the two Southern calves descended from Southern
130
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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/m1/130/?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.