In a study published by the Centers for Disease Control and Prevention on Wednesday, the Pfizer-BioNTech COVID-19 vaccine was 94 percent effective at preventing hospitalizations in fully vaccinated individuals aged 65 and up, according to CNBC.

The study also showed that the two-dose vaccine was still 64 percent effective at preventing hospitalization in the elderly who had received only one shot. The study was comprised of 417 hospitalized elderly individuals from January to March.

“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 said. “Vaccination is a critical tool for reducing severe COVID-19 in groups at high risk.”

The CDC has been increasing its studies on the vaccine as it continues to encourage the American public to get inoculated. According to the CDC, more than 81 percent of individuals 65 or older have received at least one dose of the COVID-19 vaccine as of Tuesday. More than 67 percent of individuals aged 65 or older are fully vaccinated.

CDC Director Dr. Rochelle Walensky called the results of the study “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.”

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