QUESTIONS AND ANSWERS 179 



gitis, pharyngitis, bronchopneumonia, pleurisy, metastatis abscess 

 formation in the lungs, liver, kidneys, spleen, pancreas and other 

 parts. 



Chronic Infectious Diseases 



What genus of animals is subject to Johne's disease? State the essen- 

 tial cause. 

 Bovine. Caused by the bacillus of Johne's disease, an acid-fast 

 microorganism which resembles very much the tubercle bacillus. 



What are the ssrmptoms of Johne's disease? 



Gradual emaciation and anaemia unattended by fever or pain; 

 a persistent, thin, watery diarrhoea, containing gas bubbles; appe- 

 tite variable; diminished milk secretion; fatal termination. This 

 disease is also known as "enteritis chronica paratuberculosa" and 

 "chronic bacterial dysentery." 



State the prevention and treatment of Johne's disease. 



Isolation and destruction of affected animals; thorough disin- 

 fection of premises ; raise offspring on new or iminfected pastures. 

 No satisfactory treatment is known. 



Describe a case of epizootic lymphangitis, giving the history, symp- 

 toms and prognosis. 



(This disease is unknown in this country; the cases so diagnosed 

 are probably "sporothricosis," which is caused by a sporothriK and 

 presents similar symptoms.) 



History: Wound on the leg; unthriftj for past one or two 

 months ; development of multiple, nodular swellings on the wounded 

 leg; bursting of nodules and a discharge of thick, yellowish, oily 

 pus; nodules vary in size from a pea to a hen's egg; scar formation ; 

 disease gradually extended up the leg, along the lymphatic vessels 

 to the inguinal lymph-gands. 



Symptoms: Buds, ulcers or sores, characterized by exuberant 

 granulations, fungoid appearance, indurated base and well-defined 

 edges, discharging yellowish, oily pus ; nodules of various sizes ; in- 

 duration of inguinal lymph-glands and swelling of the lymphatics ; 

 normal temperature and good appetite. 



Prognosis: Usually recover with a resultant pachydermatitis 

 of the affected leg. Mortality, 7 to 10 per cent. 



What is the treatment for epizootic lymphangitis? 



Antiseptics ; open abscesses ; curette ; cauterize. Give potassium 

 iodide internally. 



