Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 133
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IMMUNITY AND PROTECTIVE INOCULATION
133
In these animals the severity of the first attack is best measured by
the intensity of the destruction of red corpuscles. The number of cor-
puscles in No. 51 had fallen below 1.5 millions on November 4, 1889. In
No. 53 they fell to 2,5 millions. In No. 64 they had fallen to 2.7 mil-
lions on November 7, but there were still many infected corpuscles in
the circulation. In No. 65, they numbered only 1.7 millions November
4. No. 75 was not examined. The result of the second exposure in 1890
is, briefly, as follows:
No. 51 dies of an acute attack August 26.
No. 53 probably not affected.
No. 64 passes through a prolonged, but rather mild attack.
No. 65 passes through a mild attack (exposure late) and dies some time after.
No. 75 probably not affected.
Experiment 10 (see page 103).-No. 47 (cow, 41 years) had passed
through a rather severe attack in the fall of 1889. The red corpuscles
at that time fell below one million. July 4, 1890, she was placed in
Field VIII, into which only adult cattle ticks had been thrown. She
died of an acute attack September 12.
Experiment 14 (see page 107).-The following recovered cases of 1890
were exposed with fresh natives to North Carolina cattle July 2, 1891:
No. 56 (steer, 4 years) passed through a prolonged attack in fall of 1890.
No. 102 (cow, 7 years) passed through an acute attack (due to ticks only) in sum-
mer of 1890.
No. 130 (cow, 6 years) passed through a rather severe attack (Experiment 13) in
artificially heated stable (1890-'91).
No. 143 (heifer 2j years) passed through a doubtful attack (Experiment 13) in
artificially heated stable (1890-'91).
The result of this exposure is, in brief, as follows:
No. 56 passed through a mild attack.
No. 102 was slightly, if at all, affected.
No. 130 died from an acute attack August 27.
No. 143 passed through an acute attack and recovered.
Experiment 17 (see page 111).-In addition to the natives, not hitherto
exposed, which were placed into Inclosure VI, in 1892, together with
fresh North Carolina cattle and ticks, the following recovered cases
were included:
No. 135 reixposed July 20. This animal had passed through an attack in Field
VIII (ticks only) in 1890. This summer it was again attacked, and the red corpuscles
at one time were found as low as 2,000,000.
No. 167 was reexposed on the same day with the preceding. It had passed
through an acute attack last year, and was very low for a time. This summer there
was probably a slight attack, as the blood corpuscles, though they did not fall be-
low 5,000,000, showed signs of regeneration.
The following cases were reixposed together on August 26, in the
same field, and a hitherto unexposed native, a bull (No. 204), 21 years
old, was put in with them as a control, since the season was now some-
what advanced:
No. 56 had passed through a prolonged but mild attack in the fall of 1890. In 1891
it was again exposed and passed through a short, acute attack. This summer there
was probably a very short attack, as is indicated by the record of the red corpuscles.
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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/m1/133/?q=%221863%22&rotate=90: 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.