[Yaelle]

The vaccine for the 2018 season includes H1N1, H3N2, and two other strains.

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You just answered my next question. (Whether H1N1 was predicted)

Wonder if Bre had a flu shot.

[Pelham]

“Wonder if Bre had a flu shot.”

It takes about two weeks for the shot to build up your immunity. If she was exposed before or during that two week period she would still get the flu.

And getting the vaccine isn’t a 100% guarantee that you won’t get sick. The vaccine is 40-60% effective for most flus, but around 65% effective against the H1N1 she was diagnosed with.

A lot of the way that the vaccine works is through “herd immunity”. It works often enough that it breaks the chain of transmission. So you might get pockets of flu, but it prevents a widespread pandemic like 1918.