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Yeah, it's a pretty deadly disease. Vaccines work by preparing your body to fight a disease more easily if you get it. They don't physically prevent you from getting it in the first place (that's the effect of physical barriers - distance, masks, etc. - as well as a secondary effect of other people being vaccinated and having reduced viral loads and coughing less). Your body still has to fight off the infection with…
https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd...
The majority of those hospitalized cases aren't really "healthy". Most suffer from serious co-morbid conditions such as obesity or diabetes.
https://www.wfae.org/health/2021-09-30/novant-says-9-of-10-c...
https://www.cdc.gov/coronavirus/2019-ncov/need-extra-precaut...
And only a small fraction of hospitalized cases are treated with mechanical ventilation. It's considered a salvage treatment when all other treatments have failed.
https://www.cdc.gov/nchs/covid19/nhcs/intubation-ventilator-...