Why is it difficult to develop vaccines for some diseases?
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it is difficult to develop vaccines for some diseases because it so happens that the microbe causing the disease has different effects on different bodies. for example if take the case of AIDS the virus causing the disease takes different forms in different bodieswhich makes it impossible to create a specific vaccine for it.
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Viruses don't have their own cellular machinery they use the cellular machinery of host. if antiviral drugs are to be made then they may block the biochemical Pathways of host cell.
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