The Pfizer–BioNTech and Moderna COVID-19 vaccines were found to be 94 percent effective in health care workers, according to the Centers for Disease Control and Prevention’s (CDC) ongoing largest effectiveness study.
The interim study results released on Friday further support previous data on the effectiveness of the two vaccines, which use mRNA technology and have been widely administered in the U.S.
The researchers estimated that those who were fully vaccinated were 94 percent less likely to develop symptomatic COVID-19, while people who were partially vaccinated were 82 percent less likely.
The CDC highlighted that the sample size reached a broader geographic area than the clinical trials, providing more evidence for the effectiveness.
“This report provided the most compelling information to date that COVID-19 vaccines were performing as expected in the real world,” Director Rochelle WalenskyRochelle WalenskyFauci says school should be open ‘full blast’ five days a week in the fall Overnight Health Care: CDC says vaccinated people can take masks off indoors and outdoors | Missouri abandons voter-approved Medicaid expansion | White House unveils B plan to hire public health workers CDC says vaccinated people can take masks off indoors and outdoors MORE said in a statement. “This study, added to the many studies that preceded it, was pivotal to CDC changing its recommendations for those who are fully vaccinated against COVID-19.”
The research involved 1,843 health care professionals between January and March of this year after most workers in the field were given priority to get the vaccine early in the country’s rollout. The data came from a network covering health care workers in 33 sites across 25 states.
Health care workers were considered unvaccinated if they had not received any COVID-19 vaccine or only received the first dose after the test date. Fully vaccinated people were defined as those who received their second shot seven or more days ago. Partially vaccinated people referred to those who got their first dose at least 14 days ago, including those who got their second dose six or less days before.
“The mRNA vaccines are highly effective at preventing symptomatic COVID-19 among U.S. HCP [health care personnel],” the research said. “High vaccination coverage among HCP and the general population is critical to prevent COVID-19 in the United States.”