Answers

2015-10-24T23:17:32+05:30
vaccine is a medicine.it is a preparation of the virus of cowpox taken frm infected cows and inoculated in humans to produce immunity to smallpox.
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2015-10-24T23:24:26+05:30
A preparation containing usually killed or weakend microorganisms that is given usually by injection to increase protection against a particular disease.
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