How does the flu shot work? How it protects against the flu and why it changes every year

The flu shot works by introducing your body to antigens, which helps your immune system produce antibodies that allow your body to fight infection.
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HMPV: What are the symptoms of the respiratory virus and how does it spread?

HMPV symptoms include coughing, fever, nasal congestion and shortness of breath, according to the CDC. "Like many other respiratory virus infections, most people do not get tested to determine what ...