One way to immunize children is to inject them with a tiny amount of a protein that is found on the outer coat of viruses. This allows their body to practice recognizing the identity of these proteins, so that if they ever actually arrive in their body while on a live virus, their body can recognize it and can mount an immune attack against it. However, taking this protein from natural viruses and then injecting it into children can sometimes have dire consequences, and live viral contamination can occur. Given what we have learned so far, how could you, as a molecular biologist, produce a better vaccine?
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