CHAPTER IV. 



DISEASES CAUSED BY BACTERIAL INVASION. 



HOW BACTERIA GAIN AN ENTRANCE 



TO THE SYSTEM. 



Parkes, in his "Manual of Hygiene and Pub- 

 lic Health," gives the following table of dis- 

 eases due to the invasion of the human struc- 

 ture by bacteria. He divides these diseases 

 into five classes, viz. : 



CLASS I. 



Smallpox, Influenza, 



Scarlet Fever, Relapsing Fever, 



Measles, Diphtheria, 



Mumps, Erysipelas, 



Chicken-pox, Typhus, 



Whooping Cough, Epidemic Pneumonia. 



CLASS II. 



Yellow Fever, Dysentery, 



Cholera, Diarrhoea. 



Enteric (Typhoid) Fever, 



CLASS III. 



Anthrax or Malignant Pustule, Vaccinia, 

 Foot and Mouth Disease, Ophthalmia, 



Leprosy, Syphilis, 



Glanders, Gonorrhoea, 



Rabies, Tetanus. 



CLASS IV. 



Erysipelas, Hospital Gangrene, 



Septicaemia, Puerperal Fever. 



CLASS V. 



Tuberculosis, including Lupus and Scrofula. 



I. — Diseases placed in class one are desig- 

 nated as air-borne, in other words, diseases 

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