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A comment on Coronavirus patients start to overwhelm US hospitals. Parent comment
My understanding is that the 'flu shot' changes every year, in anticipation of the strains predicted to be the most prevalent that year.
In other words, flu shot producers say "we think flu strains A, B, and C will spread this year" and strains B, C, and D may be what actually spread.
It's still worth getting because even if you catch strain D, your immune system still easily defeated B and C when exposed and you didn't even notice.
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My understanding is that the 'flu shot' changes every year, in anticipation of the strains predicted to be the most prevalent that year.
In other words, flu shot producers say "we think flu strains A, B, and C will spread this year" and strains B, C, and D may be what actually spread.
It's still worth getting because even if you catch strain D, your immune system still easily defeated B and C when exposed and you didn't even notice.