Since this is not my area of expertise, I searched Google under the key words "vaccine" to get these possible sources:
http://en.wikipedia.org/wiki/Vaccine
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/V/Vaccines.html
http://www.chop.edu/consumer/jsp/microsite/microsite.jsp?id=75918
http://www.whale.to/vaccines.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
Support how a vaccine can help prevent an infectious disease.
Please Help!!
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