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What step is essential to the traditional production of flu vaccine？ [A]Manufactur

What step is essential to the traditional production of flu vaccine？

[A] Manufacturers implant the vaccine into ordered chicken eggs.

[B] Scientists identify the exact strain soon after a flu pandemic starts.

[C] Public health measures are taken as an important pandemic-fighting tool.

[D] Viruses are deadened and made clean before being put into vaccine use.

提问人：网友hbcblsw 发布时间：2022-01-07

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