Two COVID-19 Vaccines Found Highly Effective in Real-World US Study

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The two COVID-19 vaccines built on the new messenger RNA technology are highly effective in preventing infections of the CCP virus, which causes COVID-19, according to a newly released real-world study.

Vaccines from Pfizer/BioNTech and Moderna reduced the risk of infection by 90 percent two or more weeks after the second vaccination, according to the study.

Both vaccines require two doses spaced several weeks apart. But even one dose of either decreased the risk of infection by 80 percent two or more weeks later, researchers said.

“This study shows that our national vaccination efforts are working. The authorized mRNA COVID-19 vaccines provided early, substantial real-world protection against infection for our nation’s health care personnel, first responders, and other frontline essential workers,” Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC), said in a statement.

“These findings should offer hope to the millions of Americans receiving COVID-19 vaccines each day and to those who will have the opportunity to roll up their sleeves and get vaccinated in the weeks ahead. The authorized vaccines are the key tool that will help bring an end to this devastating pandemic,” she added.

The study was conducted by researchers at the CDC, a federal agency.

Some 3,950 healthcare workers, first responders, and other workers described as being essential and frontline jobs volunteered for the study. They were tested weekly for COVID-19 for 13 consecutive weeks, starting in mid-December 2020. Participants self-collected a nasal swab, which was tested in a laboratory in Wisconsin.

Among the participants, nearly 63 percent, or 2,479, received two vaccine doses. Another 12 percent received only one dose. The rest received no doses.

Epoch Times Photo
A healthcare worker prepares a COVID-19 vaccine at Lestonnac Health Clinic in Orange, Calif., on March 9, 2021. (John Fredricks/The Epoch Times)

The participants live and work in Portland, Oregon; Temple, Texas; Salt Lake City, Utah; Duluth, Minnesota, Miami, Florida; and several locations in Arizona, including Phoenix.

The findings come after a string of studies indicated the vaccines are effective in preventing transmission of the CCP (Chinese Communist Party) virus, also known as SARS-CoV-2.

Zain Chagla, an infectious disease physician at St. Joseph’s Healthcare Hamilton in Ontario, Canada, said in a tweet that the study provided “reassuring real world data” about mRNA vaccinations.

Researchers said the study was subject to at least three limitations, including the fact that specimens were self-collected, which combined with delays in shipping could reduce sensitivity of virus detection by testing. “if this disproportionately affected those who received the vaccine (e.g., because of possible vaccine attenuation of virus shedding), vaccine effectiveness would be overestimated,” they wrote.

The United States has fully vaccinated over 51.5 million people against the CCP virus as of March 28, with another 42 million receiving one of two doses.

Roughly one out of two Americans 65 years or older have been fully vaccinated.



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