Healthcare workers are examining a 45-year-old unvaccinated Covid-19 patient after he was diagnosed on Jan.

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Unvaccinated people are 11 times more likely to die of Covid-19 than vaccinated people, according to a large study by the Centers for Disease Control and Prevention.

The study looked at Covid-19 cases, hospitalizations and deaths in 13 states “and found further evidence of the effectiveness of the vaccination,” said CDC director Dr. Rochelle Walensky in a briefing on Friday.

More than 600,000 Covid cases from April to mid-July were analyzed and linked to the vaccination status.

Those who weren’t vaccinated were about 4.5 times more likely to contract the virus, more than 10 times more likely to be hospitalized with the virus, and 11 times more likely to die from the disease.

A previous CDC study, which was based on data from just 43,127 Covid cases in Los Angeles County between May and July, found that unvaccinated people were five times more likely to get Covid and 29 times more likely to be hospitalized with the virus.

According to the CDC, approximately 54% of the US population is fully vaccinated.

“Vaccination works,” said Walensky. “We have the scientific tools we need to end this pandemic.”

Rochelle Walensky, director of the U.S. Centers for Disease Control and Prevention (CDC), attends a subcommittee hearing of the Senate Appropriations in Washington, DC on Wednesday, Jan.

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The study will be published on Friday in the upcoming Morbidity and Mortality Weekly Report.

President Joe Biden on Thursday unveiled a comprehensive plan to increase Covid-19 vaccination rates in the US, pressured private employers to immunize their workforce, and mandated vaccinations for federal employees, contractors and healthcare workers.