CHAPTER IV. 
DISEASES CAUSED BY BACTERIAL INVASION. HOW 
BACTERIA GAIN AN ENTRANCE TO THE SYSTEM. 
Parkes, in his “M.anual of Hygiene and Public 
Health,” gives the following table of diseases due 
to the invasion of the human structure by bac¬ 
teria. He divides these diseases into five classes, 
viz.: 
CLASS I. 
Smallpox, 
Scarlet Fever, 
Measles, 
Mumps. 
Chicken-pox, 
Whooping Cough, 
Influenza, 
Relapsing Fever, 
Diphtheria, 
Erysipelas, 
Typhus, 
_ Epidemic Pneumonia. 
CLASS II. 
Yellow Fever, 
Cholera, 
Enteric (Typhoid) Fever, 
Dysentery, 
Diarrhoea, 
CLASS III. 
Anthrax or Malignant Pustule, 
Foot and Mouth Disease, 
Leprosy, 
Glanders, 
Rabies, 
Vaccinia, 
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