GENERAL PART OF EXAMINATION. 73 



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°-10S°F., appetite im- 

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

 hide in 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 20-100%. 



Texas Fever. An infectious blood disease of the ox caused 

 by a protozoon {Pyrosoma bigemiiium) 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%l. 



Chicken cholera. Attacks all kinds of fowls. Incubation 

 period one day. Birds sit languidly on the ground, feathers ruffled, 

 eyelids closed and stuck with exudate. Temperature 42-43.2° C. 

 Respirations increased, jerky, and often noisy. Appetite lost. Thirst 

 increased. Feces watery, greenish, yellow or bloody, mixed with 

 mucus and fetid. Death in three days with sinking temperature. 

 Often apoplectic death. 



Chicken pest is an acute, very transmissible infectious dis- 

 ease, generally distributed. Affects usually only chickens and clin- 

 ically and pathologically very like cholera. The patients never show 

 diarrhea, the course is slower and apoplectic death does not occur. 

 The virus, contrary to chicken cholera, is ultramicroscopic. 



Hemorrhagic septicemia (Wild-und Rinderseuche) is an acute, 

 general infectious disease appearing in the exanthematous, pectoral 

 and intestinal form. High fever. In cattle a hard, inflammatory- 

 hemorrhagic edema of the head and swelling of the tongue occurs. 

 Dyspnea. 



Swine erysipelas (Rotlauf) is an acute, infectious disease, 

 usually fatal. Incubation period 3-5 days. Sudden fever, ereat lan- 

 guor, weakness of the hind parts, stupor. Patients burrow in s f raw. 

 Vomiting. Skin between thirfis, under belly, neck and chest diffusely 

 reddened. Dyspnea. Death in four days. 



Braxy of Sheep. A peracute hemorrhagic inflammation of 

 the abomasum due to the bacillus gastromycosis ovis. In many 

 respects resembles anthrax. 



