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When a disease of epidemic proportions threatens the public, scientists immediately get to work, ...

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The way that vaccines protect people from diseases.  The effectiveness of vaccines in eradicating certain diseases.  The practical use of a vaccine to control an epidemic disease.  The possible negative outcome of administering vaccines.  
By training the immune system to fight weaker versions of the disease.  By passing information on how to fight the disease to the immune system.  By weakening the disease so that the immune system can defeat it.  Introducing the disease to the body, so that survivors have already fought it.  
luck  triumph  blessing  promise  
It is the same as an epidemic.  It always follows an epidemic.  It is widespread and serious.  It kills all people who are infecte  
Fortunately  Approximately  Naturally  Specifically  
wiped out  ruled out  break down  died out  
transmitted  transferred  transported  transformed  
radically  directly  properly  presumably  
demonstrate the impact of modern medicine on epidemic disease  refute allegations of unreliability made against the historical record of colonial America  advocate new research into the continuing problem of epidemic disease  confirm the documentary evidence of epidemic disease in colonial America  
infectious  inferior  infinite  inevitable  
eliminate  identify  develop  deliver  
quit  halt  assist  hail  
strain  spell  series  fit  
demonstrate the impact of modern medicine on epidemic disease.  refute allegations of unreliability made against the historical record of colonial America.  advocate new research into the continuing problem of epidemic disease.  confirm the documentary evidence of epidemic disease in colonial America.  
so  too  rather  quite  
A possible negative outcome of administering vaccines.  The practical use of a vaccine to control an epidemic disease.  A method by which vaccines are employed against the disease.  The effectiveness of vaccines in curing certain disease.  
handle  familiarize  deal  tackle  
The way that vaccines protect people from diseases.  The effectiveness of vaccines in eradicating certain diseases.  The practical use of a vaccine to control an epidemic disease.  The possible negative outcome of administering vaccines.  
A possible negative outcome of administering vaccines.  The practical use of a vaccine to control an epidemic disease.  A method by which vaccines are employed against the disease.  The effectiveness of vaccines in curing certain disease.  

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