Children should never be sent to school and should not 

 play with other children when they have any of the signs 

 which may mean an attack of communicable disease, par- 

 ticularly if there is reason to think they may have been 

 exposed to infection. 



The principal signs of the beginning of an attack of com- 

 municable disease are the following: 



Coughing, Watery eyes, 



Sneezing, Headache, 



Running nose, Vomiting, 



Sore throat, Diarrhea, 



Feverishness, Swelling or pain^back 

 Rash or spots of any kind, of or under the ears. 

 Weak, tired feeling, 



In each particular disease a certain time must elapse 

 tween the day when a person first gets the 

 rm into his body and the day when the 

 actual symptoms of disease appear. This is 



between the day when a person first gets the T . .. 



germ into his body and the day when the p . , . 



called the period of incubation. During this ^. 



.Diseases 

 time the germs are growing in the body until 



there are enough of them to make the person feel sick. The 

 incubation period varies with different diseases, from a few 

 days to several weeks. The periods for the commoner dis- 

 eases are shown in the table below. 



Disease Incubation Period 



Chickenpox 11-22 days 



German measles 11-22 days 



Measles 8-15 days 



Mumps 15-22 days 



Scarlet fever 7 days 



Whooping cough 14 days 



Those who have been exposed to any of the communicable 

 diseases should be kept under observation, and if possible 



37 



