Identify some of the various causative agents of “stomach flu” and compare them to the influenza virus. Explain how a vaccine provides immunity against infection.

Influenza vaccine Part I—Flu and “Flu” Karen and Mary work at a grocery store. Mary is a nursing student and works part time to pay for her living expenses. Karen has worked at the grocery for nearly 30 years, since she was 22. The two of them are talking when Karen points to one of […]

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