Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 134
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134 TEXAS OR SOUTHERN CATTLE FEVER.
No. 105 had passed through an acute and prolonged fever in Field VIII (ticks only)
in 1890, followed by a relapse later on in the same season. A second exposure in
September of 1891 was apparently negative. This summer, however, the disease
reappeared on exposure, the loss of red corpuscles being fairly severe.
No. 160 was exposed late in 1891 and passed through a short but acute attack, fol-
lowed by a relapse which lasted into December. This summer the exposure was
evidently negative.
No. 166 was infected with artificially hatched ticks in 1891, and passed through an
acute and rather prolonged attack. This summer the exposure was negative.
No. 182 passed through an acute attack late last year as the result of the intrave-
nous injection of infected blood. This year the exposure resulted in a slight attack.
No. 185 at the same time passed through a similar attack, due to inoculation. This
summer the exposure was negative.
No. 204. The control exposed at the same time in this field passed through a very
acute attack, and was probably saved by its age. No. 225, which had just passed
through the disease due to an infection with artificially hatched ticks, and whose
blood corpuscles had nearly reached the normal, was transferred to this field August
30, four days later than the preceding lot. A second attack was the result, with a rapid
and extensive loss of corpuscles. This case is merely introduced to show the intensity
of the infection still existing in this field, but it can not be wholly regarded in the
light of a control.
The following table gives a brief rdsum6 of these exposures:
Nature of attack.
No. 1890. 1891. 1892.
56......... Mild, prolonged.................. Short, acute ...................... Slight(?).
105......... Acute, prolonged, with relapse... Negative.----................ ........ Fairly severe.
135......... Acute ...----------------------------------------------------- Do.
160........................................ - - Short, acute, with relapse......... Negative.
166..................................------------------ Acute, prolonged................. --------------o.
167 ... ......--- ...........................---------Acute............................Slight(?).
182........ ..-- ---------------------------------- ----- o...... ........ ..... . Mild, short.
185.............................................-------------------do........................... Negative.
204 ------------...................------------------------------------------------............... Very acute.
(Control.)
These experiments demonstrate the important fact that one attack of
Texas fever does not necessarily protect the animal from a second attack.
Of the eighteen cases seven may be said to have remained practically
unaffected during the second exposure. Of the remaining eleven three
died during the second exposure. It is impossible to determine in
such cases how much natural immunity existed before the first attack.
Thus No. 53 survived the first attack while another cow exposed at the
same time and nearly of the same age succumbed to an acute attack.
No. 75, the heifer which passed through the first exposure as a calt 4
months old, is hardly to be regarded as a fair case. Hence we must be
cautious in giving even in these cases too much credit to the first attack
in warding off the following one. It is not to be denied that in the case
of animals not more than 21 or 3 years old a first mild attack may pre-
vent a second fatal attack in many cases, and a first acute attack may
be followed by a very mild infection, but it may be laid down as a gen-
eral proposition that a single attack is not sufficient to produce complete
immunity.
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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/m1/134/?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.