Which of the following viruses are made by the mass production of virulent viruses?

Which of the following viruses are made by the mass production of virulent viruses? Correct Answer Inactivated virus vaccines

Inactivated virus vaccines are made by the mass production of virulent viruses and then inactivating the infectivity. The inactivation is done usually by treatment with a chemical such as formaldehyde. It is also known as the killed virus vaccine.

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