Articles and essays on burning issues before humanity
Listed: Nov 11, 2010
Articles and essays on burning issues before humanity
Listed: Nov 11, 2010
Rating:
Vaccines are immunobiological substances that are similar to the disease causing agents, of course except the capability to produce the full fledged disease. some of the these agents produce the disease but they are of very mild variety than the original disease against which the vaccine is given.
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