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> So why is "get you vaccine and booster" in the first sentence?

It's literally there in the second sentence -

"The odds of illness severe enough to warrant hospitalization are dramatically lowered if you stay up to date on your COVID-19 vaccine, including a booster dose."

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That was true for delta. Omicron is completely different regarding hospitalization data.

The absolute rate is lower for Onicron, but vaccinations still drastically lower the relative rate of hospitalization even for BA.2 [1].

[1] https://mobile.twitter.com/EricTopol/status/1505262670714322...

“Vaccine effectiveness of the mRNA vaccines to prevent COVID-19-associated hospitalizations included: 85% (95% CI: 82 to 88%) for 2 vaccine doses against Alpha; 85% (95% CI: 83 to 87%) for 2 doses against Delta; 94% (95% CI: 92 to 95%) for 3 doses against Delta; 65% (95% CI: 51 to 75%) for 2 doses against Omicron; and 86% (95% CI: 77 to 91%) for 3 doses against Omicron.”

Less effective, but not ineffective, especially after a booster.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8845432/

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