virus vaccine is hard to make because6
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It took 26 years to develop a vaccine for the human papilloma virus, for ... The problem gets even harder if the COVID-19 vaccine,
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Because in virus vaccine
It is a biological preparation in which dead killing microbes or non - virulent viruses enter in the body by man made due to this body make antibodies against the microbes.
But corona virus body coating is not repture by body so it is hard and expensive.
It is a biological preparation in which dead killing microbes or non - virulent viruses enter in the body by man made due to this body make antibodies against the microbes.
But corona virus body coating is not repture by body so it is hard and expensive.
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