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English, 06.05.2020 03:19 Solany6426

1)
A ___ is a non-living infectious particle. The different varieties of flu viruses are called ___.
The Spanish flu outbreak occurred in___. The___ determines which strains of influenza virus will most
likely be those that are the most active during the flu season. An ___ is a part
of the viral coating that the immune system recognizes.
___ flu shots contain
antigens from three strains of flu virus.

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A ___ is a non-living infectious particle. The different varieties of flu viruses are calle...

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