how does a vaccine offer protection against diseases ?
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A Vaccine introduces a Dead specimen of a specific virus or bacteria or whatever the harm causing organism is..the body doesn't know it's dead nd attacks nd destroys it..the White blood cells remember that this germ type must be destroyed..so whenever a real healthy germ enters the body it's immediately destroyed..a disease occur when a germ enters nd reproduces nd becomes in large quantities in us..the body usually takes action late as it doesn't recognize..but a Vaccine helps the body by making it know that this germ must be killed..
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