A healthcare worker administers a dose of the Moderna Covid-19 vaccine at Nassau Community College in Garden City, New York, on Saturday, Jan. 30, 2021.

Johnny Milano | Bloomberg | Getty Images

The Pfizer-BioNTech and Moderna Covid-19 vaccines are 94% effective at preventing hospitalizations among fully vaccinated adults ages 65 and older, according to a real-world study published Wednesday by the Centers for Disease Control and Prevention.

The two-dose mRNA vaccines were also found in the study to be 64% effective at preventing hospitalizations in the elderly who received just one shot. The study evaluated 417 hospitalized adults across 14 states from January to March. The U.S. agency said the findings were consistent with those found in clinical trials.

"This multisite U.S. evaluation under real-world conditions suggests that vaccination provided protection against COVID-19–associated hospitalization among adults aged ≥65 years," the CDC wrote in the study. "Vaccination is a critical tool for reducing severe COVID-19 in groups at high risk."

The CDC study provides more evidence on the benefits of getting vaccinated against the virus, which has infected more than 32.1 million Americans and killed at least 573,420, according to data compiled by Johns Hopkins University.

Health officials had previously said Covid-19 hospitalizations among older Americans, who are at increased risk for severe disease, have tumbled since the shots first became available in the United States late last year.

As of Tuesday, more than 81% of U.S. adults ages 65 and older have received at least one dose of a Covid-19 vaccine, according to data compiled by the CDC. More than 67% of U.S. adults ages 65 and older are fully vaccinated, according to the CDC.

In a statement Wednesday, CDC Director Dr. Rochelle Walensky said the agency's findings were "encouraging and welcome news."

"The results are promising for our communities and hospitals," she said. "As our vaccination efforts continue to expand, COVID-19 patients will not overwhelm health care systems — leaving hospital staff, beds, and services available for people who need them for other medical conditions."

Earlier this week, White House chief medical advisor Dr. Anthony Fauci said Americans should begin to see a turning point in the pandemic "within a few weeks" as the U.S. continues to vaccinate Americans at a rapid pace.

The U.S. is reporting an average of 2.7 million daily Covid-19 vaccinations over the past week, according to data from the CDC, about equivalent to levels one month ago.

If the U.S. continues its vaccination pace, "literally within a few weeks, we're going to start to see a turning around of the dynamics," Fauci said Monday during a virtual event hosted by the Harvard T.H. Chan School of Public Health.

"Not down to no infections," he said. "If you're waiting for classic measles-like herd immunity, that's going to be a while before we get there. But that doesn't mean we're not going to have a significant diminution in the number of infections per day and a significant diminution in all of the parameters, namely hospitalizations and deaths."

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