- According to a new analysis by the Centers for Disease Control and Prevention (CDC), vaccines with COVID-19 mRNA reduce the risk of infection by 91% after two doses and 81% after one dose.
- The study also concluded that those with SARS-CoV-2 infection experienced a milder illness.
- Similarly, few who develop COVID-19 are ill in less time.
In the new
The study was one of the first to demonstrate that Pfizer-BioNTech and Moderna vaccines are beneficial to people who receive COVID-19, even though they receive full or partial vaccinations.
The HEROES-RECOVER study included data from individuals who had increased potential exposure to SARS-CoV-2, including healthcare workers, first-line workers and responders.
The researchers released in advance
After the initial analysis, the CDC continued to collect data. The latest press release is based on an additional 4 weeks of data.
The latest analysis uses data from 3,975 participants in eight regions of the United States. Each person receives tests for SARS-CoV-2 infection once a week for 17 weeks, from December 13, 2020 to April 10, 2021.
The researchers tested positive for viral load. They also measured how long participants tested positive for SARS-CoV-2 to determine the rate of viral shedding.
During the analysis, the researchers looked at other factors that could affect the results, including how often participants used personal protective equipment at work and in the community and the spread of SARS-CoV-2 in their local area.
In general, the scientists concluded:
“Once fully vaccinated, the risk of infection in participants is reduced by 91%. After partial vaccination, the risk of infection in participants was reduced by 81%. These assessments include symptomatic and asymptomatic infections. “
To understand how vaccination affected the course of SARS-CoV-2 infection, the researchers compared those who developed a viral infection despite vaccination to those who had the virus but did not receive the vaccine.
This analysis demonstrated that individuals who received partial or complete vaccination and developed COVID-19 were ill for 6 fewer days and spent 2 fewer days in bed than those who developed COVID-19. 19 and have not been vaccinated.
Similarly, vaccinated people are about 60% less likely to develop symptoms such as fever or chills than those who are not.
Their findings also suggest that people who develop COVID-19 and are fully or partially vaccinated may be less likely to pass the virus on to others.
This, as explained in the press release, is because “fully or partially vaccinated study participants had 40% less detectable virus in their nose. […]and the virus was detected in 6 less days […] compared [with] those who have not been vaccinated when [acquiring the infection]. “
The researchers also showed that those who received partial or complete vaccination had the virus for a shorter time. Vaccinated people are 66% less likely to test positive for more than 1 week than unvaccinated people with SARS-CoV-2 infection.
As explained in the press release, “Although these indicators are not a direct measure of a person’s ability to spread the virus, they [have correlations] with reduced spread of other viruses, such as chickenpox and influenza. “
Overall, the findings add real evidence that COVID-19 vaccines are the best way to reduce the incidence of COVID-19, minimize serious disease, and stop the spread. The press release ends with a note:
”[T]the results of the study support the CDC’s recommendation that you be fully vaccinated against COVID-19 as soon as possible. Anyone over the age of 12 can now be vaccinated against COVID-19 in the United States. ”
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