106 SAPROPHYTISM, PARASITISM, AND PATHOGENISM 



tissues whenever the natural barriers skin, mucous membranes, and 

 so on weaken and become vulnerable. 



The following table indicates the more common and important 

 bacteria, parasitic or pathogenic, which may invade the tissues, and 

 the organs where they tend to localize and develop. 



SKIN: 



Staphylococcus and streptococcus groups. 



Acid-fast group: tubercle bacilli, lepra bacilli, smegma bacilli. 



Anaerobic group: tetanus, gas bacillus. 



Anthrax. 



"Bottle" bacillus (spore of Melassez). 

 NOSE, THROAT AND ADNEXA: 



Staphylococcus group. 



Streptococcus and pneumococcus group. 



Diphtheria and pseudodiphtheria group. 



Influenza and pertussis group. 



Pneumobacillus, rhinoscleroma and ozena group. 



Bacillus fusiformis and spirillum group. 



Meningococcus and catarrhalis group. 



Acid-fast group 'Chiefly tubercle bacilli and leprosy. 



Blastomycetes and hyphomycetes. 



Virus of poliomyelitis and unknown viruses, mumps, etc. 



(Organisms of dental caries and pyorrhea not included above.) 

 EYE AND EAR: 



Streptococcus and pneumococcus group. 



Staphylococcus group. 



Diphtheria and pseudodiphtheria group. 



Influenza group. 



Koch- Weeks and Morax-Axenfeld group. 



Gonococcus. 



Proteus group. 



Pyocyaneus group. 

 LUNGS : 



Streptococcus and pneumococcus group. 



Pneumobacillus group. 



Acid-fast group: tubercle bacillus. 



Influenza and pertussis group. 



Plague bacillus, anthrax bacillus and B. psittacosis. 



Colon and typhoid group. 



Actinomyces and hyphomycetes. 

 PELVIC ORGANS: 



Streptococcus and Staphylococcus group. 



Gonococcus and Treponema pallidum. 



Tubercle bacillus and smegma bacillus. 



Micrococcus melitensis. 

 SEROUS FLUIDS: 



1. Cerebrospinal fluid: 



(a) Fluid usually clear: tubercle bacillus and Treponema pallidum. Virus 

 of poliomyelitis. 



(&) Fluid turbid: Pneumococcus, streptococcus, meningococcus, B. influ- 

 enza, B. typhosus, B. coli. 



2. Pleural and pericardial fluids: 



(a) Fluid usually clear: tubercle bacillus. 



(&) Fluid turbid as a rule: pneumococcus, streptococcus, B. influenzce, 

 Pneumobacillus group, Bacillus typhosus, Staphylococcus. 



3. Peritoneal fluid: 



Streptococcus group. 

 Coli and typhoid group. 

 Tubercle bacillus (?). 



