Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 83
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THE CAUSATION OR ETIOLOGY OF TEXAS FEVER.
a lamb was used. A syringeful (7 cc.) of blood was drawn from the
right jugular of cow No. 184, which was very sick at the time and
whose blood contained the micro-parasite in small numbers, and in-
jected at once into the left jugular vein of the lamb. The operation
was performed October 1, 1891; the blood contained 10,442,000 red cor-
puscles in a cubic millimeter. No parasites of any kind were detected
in them.
October 13.-Red corpuscles 8,282,000. Nothing abnormal detected.
October 27.-Red corpuscles 11,538,000. Several bright intraglobular bodies seen
in the fresh preparation, but no parasites.
From October 1 to October 27 the temperature was taken twice daily. It fluctu-
ated between 101 and 103.
Though the inoculation was made somewhat late i the season the
outcome plainly indicates no susceptibility of sheep to this disease.
Rabbits.-September 20, 1889, immediately after cow No. 54 had been
killed a quantity of spleen pulp containing many corpuscles infected
with large paired parasites was mixed with sterile salt solution. The
reddish liquid was injected into the ear vein of three rabbits. No rise
of temperature and no symptoms of disease were noticed. One rabbit
was killed on the seventh day and the blood and organs carefully ex-
amined for infected corpuscles with negative result. The others were
watched for several months, but nothing abnormal detected iii their
action. The second rabbit, which had become scabby, was killed Janu-
ary 18, 1892. The various organs and the blood were examined micro-
scopically with negative result. The following may also be cited:
October 1, 1891.-With the blood of cow No. 184 two rabbits (Nos. 140, 141) were
inoculated at the same time with the lamb. Each received 1 cubic centimeter into
the ear vein.
No. 140 (black rabbit) showed no external symptoms of disease. The blood was
examined twice and no infected corpuscles found.
October 19, 1891, 6,537,000 red corpuscles in a cmm.
December 3, 1891, 7,134,613 red corpuscles in a cmm.
No. 141 (white rabbit) remained equally well. The following blood examinations
were made:
October 19, 1891, 5,268,000 red corpuscles in a cmm.
December 3, 1891,4,533,000 red corpuscles in a cmm. Infected corpuscles absent.
Pigeons.-September 28, 1891. Blood containing infected corpuscles
isdrawn from the jugular vein of cow No. 186 and injected at once
into the wing vein of three pigeons (Nos. 2, 3, and 4). In a fourth
pigeon (No. 1) the blood failed to enter the vein and was deposited in
the surrounding connective tissue. Each received about I 1 cc.
No. 1 died October 13, though not from the inoculation, as its feathers
were ruffled at the time of the operation and it was probably not well
at that time. Examination of the blood and organs negative. The
other pigeons remained well. On October 5 the blood of No. 3 con-
tained 3,926,800, that of No. 4, 4,094,300, red corpuscles, in a cubic
millimeter. They were killed January 22, 1892. The blood of No. 3
was searched in vain for parasites.83
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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/m1/83/?q=%221863%22&rotate=0: 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.