Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 95
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TRANSMISSION OF TEXAS FEVER. 95
(a) North Carolina cattle with ticks:
No. 12, placed in this field June 27, removed August 17.
No. 40, placed in this field June 27, removed August 17.
No. 42, placed in this field June 27, removed August 17.
No. 45, placed in this field June 27, removed August 17.
(b) Native cattle:
June 27, No. 7 (cow, 6 years) placed in this field. Dead* August 23.
June 27, No. 8 (cow, 11 years) placed in this field. Killedt August 27.
June 27, No. 75 (calf of No. 8, 4 months) placed in this field. Recovered.
June 27, No. 9 (bull, 11 years) placed in this field. Died August 31.
June 27, No. 10 (calf of No. 7, 4 months) placed in this field. Died August 31.
June 27, No. 11 (calf of No. 7, 4 months) placed in this field. Killed September 10.
August 20, No. 46 (heifer, 1l years) placed in this field. Killed September 10.
August 24, No. 43 (steer, 3 years) placed in this field. Dead September 13.
August 24, No. 44 (steer, 4 years) placed in this field. Dead September 17.
September 6, No. 53 (heifer, 1 years) placed in this field. Recovered.
September 6, No. 54 (heifer, 2 years) placed in this field. Killed September 20.
September 14, No. 57 (cow, 9 years) placed in this field. No result.
September 30, No. 70 (steer, 21 years) placed in this field. Died October 19.
October 19, No. 71 (heifer, 31 years) placed in this field. Probably no disease.
The disease in this field was designed to furnish material for general
investigation as well as to serve as a control for experiment 2 below.
It illustrates admirably a number of important characters of this re-
markable disease and demonstrates once again the frequently observed
fact that cattle, to all appearances healthy, may become the cause of
an extensive fatal disease when transferred in the warmer seasons of
the year from a certain permanently infected area to territories north
of this area.
The first high morning temperature appeared August 15, or thirty-
nine days after the native and Southern cattle were placed on this field
together. The first death occurred August 23, or forty-seven days
after this same date. In other words, the cattle exposed at this time
died not less than forty-seven days after the beginning of the exposure.
After a certain time, however, death follows more speedily after ex-
posure, as may be seen when we consult those cases exposed August
20 and thereafter, for which this period was only fourteen to twenty-
three days. The field remained infected so as to cause death as late as
October 19. The later the exposure the less likely is the disease to end
fatally.
Omitting the last case, No. 71, as having been exposed too late, we
have ten deaths from thirteen cases exposed, or 76.8 per cent. It should
be noted that, although the Southern cattle were removed from the field
August 17, the infection on the field remained unimpaired.
Experiment 2 (exposure to Southern cattle without ticks).-For this
experiment, field II was selected (see Fig. 4). The soil is the same as
* Unless otherwise stated the cause of sickness and death is Texas fever.
tWith one exception (No. 163) all native animals reported killed in this report
were in a dying condition at the time.
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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/m1/95/?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.