, the Centers for Disease Control and Prevention says.
Unvaccinated adults were 3.4 times more likely to be hospitalized with COVID than those who were vaccinated, the CDC said.
The CDC report considered hospitalization numbers from March 20 to May 31, when the omicron subvariant BA.2 was the dominant strain. Researchers found 39.1% of patients had received a primary vaccination series and at least one booster or additional dose; 5% were fully vaccinated with two boosters.
“Adults should stay up to date with COVID-19 vaccination, including booster doses,” the CDC said. “Multiple nonpharmaceutical and medical prevention measures should be used to protect persons at high risk for severe SARS-CoV-2, regardless of vaccination status.”
Older adults and people with underlying medical conditions who become infected with the coronavirus are more likely to be hospitalized.
The study also found that hospitalization rates among people over 65 increased threefold over the study period. Rates among people under 65 rose 1.7 times.
A version of this article first appeared on WebMD.com.