HEALTH OFFICERS 



419 



dangerous diseases against which special precautions should 

 be taken. A comparison may be made with the average 

 statistics from other cities ; and if this shows that the death 

 rate from some particular disease is unusually high, special 

 attention may be given to controlling this desease. 



Control of contagious diseases. One of the duties to which 

 special attention is given is the prevention and control of 



SCARLET FEVER. 

 Isolation and disinfection 



DIPHTHERIA. 

 Isolation and disinfection 



FIG. 167. Effect of isolation and disinfection on scarlet fever and diphtheria. 



diseases that may be carried from one person to another, 

 such as diphtheria, smallpox, and tuberculosis. In protect- 

 ing well people from unconsciously coming into contact 

 with those who have the diseases, very strict measures must 

 be taken, such as isolating the patient and quarantining 

 people who have been exposed. Sometimes this may cause 

 some inconvenience to tb omvrned, but it is neces- 



