Protection Against Disease 



461 



a person to render him immune from an attack of diphtheria. It 

 is a simple test made by the injection of one drop of a certain 

 serum mixture into the skin of the arm. 



If the skin shows no effects from the injection, the person 

 tested is immune from the disease; but if a red spot appears, it 



Syracuse Health Demonstration. 



A WISE PRECAUTION 



Preventing diphtheria by the use of toxin-antitoxin. 



indicates that there is not sufficient antitoxin in the blood, and 

 therefore the person is susceptible to the disease. In the latter 

 case injections of toxin-antitoxin are necessary to render the per- 

 son immune. The treatment with toxin-antitoxin prevents the 

 disease while the treatment with antitoxin cures it. 



Sanitation. Sanitation deals with the ways of making our. 

 surroundings healthful. It includes the cleanliness of the home 

 and the home premises, and may involve larger problems, such 

 as the elimination of mosquitoes or other insects from a tract of 

 land or the removal of unwholesome conditions. 



