DESCRIPTIONS OF PATHOGENIC BACTERIA. 2OI 



If tubercles occur in which, instead of the 

 tubercle bacillus, other bacteria are found the 

 affection is called pseudo-tuberculosis. Ma- 

 lassez and Vignal have observed an affection 

 of this sort which is caused by cocci, A. Pfeiffer 

 and Eberth one by rod-forms, Fischel one by 

 filamentous bacteria and Eppinger one by a 

 Cladothrix. Non-communicable tubercles may 

 be produced also by the eggs of distomes and 

 by other foreign bodies ; even dead tubercle 

 bacilli may, according to Prudden, cause tu- 

 bercle formation. 



Tuberculosis occurs spontaneously in apes 

 as well as in man, and also in cattle. (In 

 these animals the form of pleural tuberculosis 

 with a tendency to calcification is called by 

 the special name Perlsucht ; the rods found 

 here are somewhat smaller and more pointed.) 



The disease occurs also in guinea-pigs and 

 rabbits. Field-mice, when artificially inocu- 

 lated, also sicken ; among dogs only over-fed 

 pet dogs, like pugs, are even relatively suscept- 

 ible ; goats seem to be immune. The disease 

 may occur epidemically among fowls and 

 pheasants. 



Infection in man is for the most part extra- 

 uterine, yet placental intra-uterine infection 

 does sometimes occur and may manifest itself 

 only after birth, thus giving an appearance as 



