VACCINATION 
509 
provide the means for the thorough purification and chang¬ 
ing of the same before general intercourse with the same 
or use thereof shall be allowed.’’ 
This means if an individual is suffering from scarlet fever 
or diphtheria, or some other communicable disease, he shall 
not associate with the general public until he has ceased to 
be a source of infection. His liberty is temporarily re¬ 
stricted by quarantine because he may be the cause of sick¬ 
ness and even death to others by spreading the germs of 
communicable disease. 
It is interesting to know that the more highly civilized 
a nation, state, or city becomes, the more specific and exact¬ 
ing are the quarantine regulations. There is every reason 
to believe that in the near future the present laws of quaran¬ 
tine will be extended. In addition to individuals being 
quarantined in a dwelling, all the inhabitants of a city or 
state may be quarantined in case of severe epidemics; or 
the transportation of stock from one state to another may 
be prohibited in the case of a serious communicable disease 
existing in cattle or sheep. The quarantine laws, for ex¬ 
ample, order from time to time that all dogs in the town or 
county shall be muzzled as a protective measure against 
rabies. 
Immigrants suffering from certain diseases are prohibited 
from landing in the United States. This means that there 
are national as well as state and city quarantine laws. The 
present quarantine laws are the most effective protective 
measures against the spread of disease known to man and 
are the product of a high degree of civilization. 
390. Vaccination. — The success which has attended the 
efforts of man to overcome disease is well illustrated by 
smallpox. For centuries this disease was responsible for 
many deaths throughout the world. It is said to have 
existed in China centuries before Christ. Later it swept 
over Europe again and again. A famous French physician 
