238 BIOLOGY OF SPECIALIZED GROUPS 



It should be remembered that all of the non-specific diseases 

 above-mentioned are not always produced by microorganisms. 

 Mechanical, physical, and chemical factors may be responsible 

 in certain rare instances. 



The diseases (non-specific) tabulated in the foregoing list 

 may be caused by a variety of bacteria. Not every disease 

 mentioned is caused by all- the bacteria tabulated. Some 

 diseases are caused by a large variety of bacteria (ten species 

 in some cases), while other morbid conditions are caused by 

 only a few species. Some of the bacteria mentioned also 

 produce specific infections when attacking the body at definite 

 points, e.g. M. gonorrhceae in the genito-urinary tract, B. 

 typhosus in the intestines, etc. They, however, not uncom- 

 monly produce non-specific infections. 



PARTIAL LIST or INFECTIOUS DISEASES OF UNKNOWN ETIOLOGY, 

 SPECIFIC AND NON-SPECIFIC 



Pertussis (Whooping cough) 



Parotitis, epidemic (Mumps) 



Spotted fever, Rocky Mountain 



Yellow fever 



Rheumatic fever (Rheumatism) 



Typhus fever 



Scarlet fever (Scarlatina) 



Aphthous fever (Foot and mouth disease) 



Hydrophobia (Rabies) 



Smallpox (Variola) 



Cowpox, Vaccination (Vaccina), same organism 



Chicken pox (Varicella) 



