48 STRANGLES 



and the localization of the lesions. In mild cases conva- 

 lescence begins in a few days, but in other cases restoration 

 may require weeks and even months. 



The mortality, according to available statistics, does not 

 exceed three per cent. 



§ 28. Differential diagnosis. Strangles is to be differ- 

 entiated from : 



■ I Purulent nasal catarrh. In this affection, there is 

 rarely suppurating sub-maxillary glands, although occasional- 

 ly these glands may be swollen. 



2 Glanders. In glanders, the tissue changes are more 

 persistent and the skin lesions, if they exist, do not heal as 

 rapidly as in strangles. In chronic cases, the diagnosis is 

 quite difficult. Here animal inoculation must be resorted to. 

 Mice inoculated subcutaneously with the nasal discharge suc- 

 cumb to the streptococcus of strangles but they are resistant 

 to the bacterium of glanders. Guinea pigs inoculated in a like 

 manner will, in case of glanders, develop that disease from 

 the lesions of which pure cultures oi Bacterium mallei may be 

 obtained. 



3 Parotiditis. In this affection the swelling is localized 

 and suppuration does not often occur. 



4 Abscesses due to pyogenic bacteria. The cases are rare 

 where there would be any question as to diagnosis. The bac- 

 teriological examination including the inoculation of animals 

 would give positive aid unless the pyogenic organism hap- 

 pened to be a virulent streptococcus in which case a differen- 

 tiation might be difficult. 



§ 29. Prevention. Isolation of the infected and removal 

 of healthy animals from the place where the diseased animals 

 came down. If in stables the stalls should be thoroughly 

 disinfected before being used for well animals. 



REFERENCES. 

 I. LiGNiERES The etiology of equine influenza as infectious- 

 pneumonia. Jour. Compr. Path, and Thera., Vol. XI {i8g8),p. 312. 

 Translated from Recueil de Med. Vet., Vol. IV (1897). 



