When a biological product contains more than one immunogenic fraction, the completed product shall be evaluated by tests applicable to each fraction.
When similar potency tests are required for more than one fraction of a combination biological product, different animals must be used to evaluate each fraction except when written Standard Requirements or outlines of production make provisions and set forth conditions for use of the same animals for testing different fractions.
When the same safety test is required for more than one fraction, requirements are fulfilled by satisfactory results from one test of the completed product.
When an inactivated fraction(s) is used as a diluent for a live virus fraction(s), the inactivated fraction(s) may be tested separately and the live virus fraction(s) may be tested separately: Provided, That, the viricidal test requirements prescribed in § 113.100 are complied with.
Virus titrations for a multivirus product shall be conducted by methods which will quantitate each virus.
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