Need biology help with Vaccination and Immunity

Since the invention of the first vaccine in the 1700s, there has been controversy whenever a new vaccine is introduced.  Are they safe? Do they work?  

Search the Internet and find credible vs. questionable sites about vaccine usage.  Using this information, share your thoughts about the safety of vaccinations.

* This is a discussion question. Does not need to be written in APA format. Needs to be 75 to 150 words.

 
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