why is it difficult to prepare vaccines for diseases caused by viruses
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because virus spread fast and immediate action against has to be taken for this.
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Many new viruses are affecting suddenly which made scientists to get shocked.
They cannot prepare antidote without study of virus.
So , they are taking much time , facing problems to overcome these viruses.
They cannot prepare antidote without study of virus.
So , they are taking much time , facing problems to overcome these viruses.
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