What is the main idea presented in this excerpt? as fewer people get the flu virus, the flu shot becomes less and less useful. as fewer people get the flu virus, the flu shot becomes more and more useful. as fewer people get the flu shot, it becomes more effective, but as more people get it, the flu shot becomes less effective. as fewer people get the flu shot, it becomes less effective, but as more people get it, the flu shot becomes more effective.
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What is the main idea presented in this excerpt? as fewer people get the flu virus, the flu shot bec...
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