Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 145
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PRACTICAL OBSERVATIONS AND CONCLUSIONS.
It will undoubtedly be conceded by all impartial readers of the fore-
going pages that the economic value of the results derived from these
investigations is very promising. As yet they are undeveloped, how-
ever, and their true importance can not be estimated. Experiments
must be built upon them in various directions. These we have thus far
been unable to undertake, owing to the large amount of labor involved
in determining the relation of ticks to the disease. In the following
pages, in addition to deductions immediately available in the control of
this disease, a few suggestions are made in regard to the objects to be
attained by further investigations and the manner in which they should
be conducted. Those readers technically interested in carrying on
such investigations will undoubtedly have read between the lines of
the foregoing chapters all that can be suggested here.
DIAGNOSIS.
One of the immediate results of the work is the simplicity and ease
with which an outbreak of Texas fever can be positively determined.
Mos veterinarians and pathologists are able to recognize Texas fever
when an acute case presents itself for post-niortem examination. The
greatly enlarged spleen, the peculiar coloration of the liver, the
thick bile, and especially the haemoglobinuria are so obvious that no
one trained to a knowledge of the appearance of the healthy organs and
excretions in cattle can make a mistake. But all cases are not in the
acute stage at the time of death, and one or several of these important
pathological changes may be missing or barely recognizable when
present. In fact, there may be no animals which can be sacrificed, and
:all may be on the road to recovery. In such cases even the clinical
:signs, such as the high temperature, may be missing.
Among the diagnostic characters to be added to the list are the
examination of the blood and the presence or absence of the cattle tick
(Boiphilus bovis). We may now consider it demonstrated that Texas
fever outbreaks in the North are not possible without the cattle tick.
Isolated cases may occur through other agencies perhaps, but no general
infection of fields or pastures is possible without the cattle tick. Hence,
in any doubtful disease where Texas fever is suspected, ticks should be
looked for, and in doing so all those facts concerning the size of the
ticks on animals in the acute stage and during recovery and their loca-
tion on the body must be borne in mind. On animals which have
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10320-No. 1-10
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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/m1/145/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas Health Science Center Libraries.