[C210N]

Oh I know, I'll just get a weekly flu shot. /sarc

[have not got the flu nor shot for upwards of 20 years now, and counting]

[Hootowl99]

A person after experiencing a bout with a specific strain of flu is less likely to be reinfected by that same flu later because the body's immune system now is activated against that flu's signature and thus is able to much more rapidly and aggressively respond to this this secondary exposure.

The flip side of this though is that the body is weakened and is more susceptible to a secondary infection. Think about a virus caused flu followed by a bacterial pneumonia. Not good. There is a progression of sorts that can follow 1,2,3. Flu to pneumonia (lungs) to meningitis (via blood to brain/spine) or rheumatic fever (blood to heart).