Rickettsial vaccines are produced by cultivating microorganisms in living tissues of

Chick embryo

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Plant body

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Artificial culture media

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All of the above

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Solution

The correct option is A Chick embryo
Rickettsial or viral vaccines are produced by cultivating microorganisms in living tissues of animal bodies, such as chick embryos. It is possible in some cases to reduce these effects by harvesting only proteins of the infected tissues. E.g., allantoic fluid of chick embryo. These viruses can be killed or inactivated with formaldehyde, phenol etc.

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