134 



COMMON DISEASES. 



The specific symptoms of farcy may be summed up as the hud, 

 the ulcer, the lymphatic cord and the characteristic viscid sticky 

 discharge. 



In the chronic forms we have similar histories and symp- 

 toms, but the latter may be less obvious and less rapidly developed 



Diagnosis . — A positive diagnosis on the clinical symptoms 

 may be made in many cases, but there are a great many cases 

 which cannot be so diagnosed with certainty. In these cases we 

 must rely upon the mallein test. 



Mallein test. — This test may be con- 

 ducted as follows : Temperatures arc 

 taken at lo a. m., 2 p. m., 4 p. m. and 

 ^ p. m. The mallein is then given by 

 hypodermic injection at about 10 p. m. 

 -On the following day temperatures are 

 taken every two hours, beginning at 6 

 a. m. and continuing until 6 or even 8 

 p. m. A rise of two degrees or more 

 above the normal range is diagnostic and 

 is determined by comparing the temper- 

 atures taken on the second day with those 

 taken on the first day of t'est. Such a rise 

 of temperature is spoken of as a reaction. 

 Reacting animals usually show a promi- 

 nent and painful swelling at the point of 

 injection. Mallein has developed the rather serious fact that there 

 are unquestionably a great many cases of glanders which are never 

 recognized, some of which are without doubt infectious. 



Prevention.— The common methods of spread must be borne 

 in min.I. and the fact be clearly realized that the germ which 

 causes glanders is very easily disseminated. Some of the more 

 common methods of spreading it arc by drinking water, feed 

 l)oxes and troughs, hitching racks and posts, and in the' large 

 cities, by the public water fountains. Any means which serves 

 to bring the virus into direct contact with mucous meml)rancs or 

 with the broken skin may be sufficient to cause an attack. Pus 

 from the farcy sores, and the nasal discharge are very virulent. 



FIG. 51. GLANDERS- 

 FARCY. (U. H. II.) 

 Farcy scais in the face. 

 An old case. 



