A、Inactivated vaccine
B、Subunit vaccine
C、Nucleic acid vaccine
D、Subunit vaccine
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.
A.provide a good match between the vaccine and the virus strains
B.save the expense in producing and distributing the vaccine
C.reduce the frequency the flu viruses change from one strain to another
D.leave time to manufacture and distribute vaccines before the flu season
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