'* CLINICAL DIAGNOSTICS. 



with food and water — (hog cholera of Smith). Period of incuba- 

 tion 4 to 21 days. Young pigs most predisposed. One attack pro- 

 duces immunity in most cases. Symptoms: apoplectic form; die 

 very suddenly or after a few hours illness (beginning of an out- 

 break). Usual form: fever, temperature 107°-108°F., appetite im- 

 paired, tremblings of muscles, unwillingness to move, stupid, dull, 

 hide hi litter. Bowels at first constipated; later diarrhea. Eye- 

 lids filled with mucus. Respiration accelerated, labored; painful, 

 frequent cough. On pendant parts of body, skin is reddened, con- 

 gested; eczematous eruptions, ulceration of skin. Rapid loss of 

 flesh, unsteady, tottering gait. Death within 48 hours to 2 weeks. 

 Mortality 20-1007o. 



Texas Fever. An infectious blood disease of the ox caused 

 by a protozoon (Pyrosoma bigcminum) which enters and destroys 

 the red blood corpuscles. The disease is spread by the cattle tick, 

 Boophilus bovis, the younger generation of which carries the pro- 

 tozoon. Period of incubation 13-90 days after exposure to tick- 

 infected places. Symptoms: fever (104°-109° F), unnatural recum- 

 bent positions and standing attitudes; animal is dull, stupid; in 

 some cases shows vicious tendencies; horns, ears, and hoofs are 

 hot. Pulse is rapid; dyspnea; constipation, excreta tinged with 

 bile. Visible mucous membranes icteric. In later stages urine red. 

 Ticks of various size to be found on escutcheon, inside of thighs, 

 base of udder or scrotum. Little blood flows from intentional 

 wounds. Characteristic post-mortem changes. Duration 3 days 

 to several weeks. Mortality 20-90%]. 



Fowl Cholera. Period of incubation 1 day. Apoplectic death 

 common. Great exhaustion, staggering, foamy mucus discharged 

 from bill, dyspnea with respiratory sounds, loss of appetite, 

 diarrhea, bacilli as in Wild und Rinderseuche (wild and cattle 

 plague). 



Braxy of Sheep. A peracute hemorrhagic inflammation of 

 the abomasum due to the bacillus gastromycosis ovis. In many 

 respects resembles anthrax. 



South African Horse Sickness. A non-contagious (though 

 readily transmittable by blood inoculation) disease of horses and 

 mules. _ Incubation 7 days. Slowly rising fever with morning 

 remissions. Symptoms of pulmonary edema (Dumperre zickte) 

 or swelling of the head (Dikkop). Great muscular weakness, ani- 

 mals recumbent. Pulse not very rapid but small. Mortality 80- 

 90%. 



