MICROBES AND THEIR CONTROL 



311 



TRANSMISSION OF COMMUNICABLE DISEASES 



Disease 



Chicken pox . . 



Diphtheria . . . 



German measles . 



Measles . . . . 



Mumps . . . . 



Scarlet fever . . 



Septic sore throat 



Smallpox 



Tetanus (lockjaw) 

 Trachoma . . . 

 Tuberculosis . . 



Typhoid fever . . 



How Germs Come 



OUT 



Mouth and nose 



spray 

 Mouth and nose 



spray; saliva 



Mouth and nose 



spray 

 Mouth and nose 



How Germs are 

 Carried 



spray 

 Mouth and nose 

 spray; saliva ! 



Mouth and nose 

 spray; saliva 



Mouth and nose 

 spray; saliva j 



Whooping cough . 



Mouth and nose 

 spray 



Contact 



Contact 



Mouth and nose 

 spray ; milk 



Mouth, excretions, 

 intestinal waste, 

 andoccasionally 

 through skin 



Mouth and nose 

 spray 



Air 



Air, objects ex- 

 posed to spray 

 or saliva 



Air 



Air 



Air, objects ex- 

 posed to spray 

 or saliva 



Air, objects ex- 

 posed to spray 

 or saliva 



Air, objects ex- 

 posed to spray 

 or saliva 



Air 



Hands or objects 



Hands, towels, etc. 



Hands, objects, 

 etc. 



Hands, various ob- 

 jects, flies 



Air 



How Germs Enter 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Nose and mouth 



Breaks in skin 

 Contact with eyes 

 Nose and mouth, 



food 

 Food 



Nose and mouth 



touch now one person and now another, it might be freed of 

 dangerous inhabitants, floating about as dust. 



S' At the points of entry into the body. This would mean 

 guarding the nose, the mouth, the eyes, and the skin generally, 

 and the avoidance of contact with food or anything else that 

 might be contaminated. 



