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The SARS-CoV-2 infection rate and hospitalization rate was 4.9 and 29.2 times higher for unvaccinated versus fully vaccinated persons.
Although the vaccinated may want boosters, the unvaccinated do not appear to be increasing their share of getting their shots.
The agency will not recommend one vaccine over another but may say that it is preferable to use same booster as the vaccine.
The booster shot is recommended for anyone 18 years and older, to be given at least two months after the first dose.
Committee members also weighed a proposal to streamline the dosing schedule for COVID-19 vaccines by turning them into annual shots.
A fourth dose reduces the risk for SARS-CoV-2 for patients with systemic autoimmune rheumatic diseases using DMARDs.
The reduction in transmission of SARS-CoV-2 associated with COVID-19 vaccination was smaller for the delta variant versus the alpha variant.
Although a second booster for older adults will be offered, federal health officials will not go so far as to recommend it.
So far, existing vaccines have proven effective against prior coronavirus variants, including the delta variant.
Vaccine protection against SARS-CoV-2 infection declined; protection remained higher against hospitalization, death.