| 11. | The vaccine protects only against respiratory illnesses caused by influenza viruses, she cautioned.
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| 12. | High-risk patients depend on the injections, which are made of killed influenza virus.
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| 13. | The antigenic properties of influenza viruses are determined by both hemagglutinin and neuraminidase.
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| 14. | An influenza virus provoked more worry than the People's Liberation Army.
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| 15. | A : Flu is caused by one of three types of influenza viruses.
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| 16. | Aviron isn't the only firm making potions to protect against the influenza virus.
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| 17. | The influenza virus had just been discovered about a few years before that.
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| 18. | Most kinds of influenza viruses live only in birds, not people.
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| 19. | Some cases may be triggered by the influenza virus and potentially influenza vaccine.
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| 20. | Here he did a series of critical experiments on the influenza virus genome.
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