Fill in the blanks with the right word from the list below. You may use each word only once.
administer, after, antibodies, diseases, fight, generally, harmless, including, injected, orally, prevent, prevention, serums, smallpox, substances, symptoms, vaccines
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Doctors use two main types of drugs for the ___________ of disease:
Vaccines contain dead or ___________ germs. They cause the body to develop ________ called ________ that act to _________ disease. Doctors _______ ________ before a person has been exposed to such ________ as poliomyelitis or __________ . Vaccines are usually ________ but sometimes are given ________ . Serums contain antibodies that ________ off the germs of certain diseases, _______ scarlet fever and lockjaw. These drugs are given ________ a person has been exposed to the disease, or after _________ of the disease have appeared. ________ are __________ administered by injection.
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