Question

Why is it difficult to develop vaccines for some diseases ?

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Answer 1

Some disease can change and mutate themselves to be immune to the certain vaccine, for example the flu virus can mutate into hundreds of thousand of different forms of itself, so it is extremely hard to completely knock down the flu. Usually scientists pick out one form of influenza which they think would be the most prominent and administer those vaccines to the recipients.

Answer 2

=> Why is it difficult to develop vaccines for some diseases ?

⬇ANSWER⬇

It is difficult to develop vaccines against the diseases caused by viruses. Viruses are very specific to hosts. They live and multiply only in the living cells. They cannot be cultured on artificial medium. It is because of these factors that vaccines are difficult to be prepared in such cases.

However, living cells of human's body which are exposed to action of a virus, secrete a heat stable basic antiviral glycoprotein of low molecular weight, called interferon.

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