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According to the CDC, the Pfizer and Moderna COVID-19 vaccines demonstrate remarkable efficacy, slashing the risk of infection by 90% within two weeks following the second dose.
A recent study by the Centers for Disease Control and Prevention involving healthcare workers and first responders has confirmed that both vaccines are significantly effective at preventing infections in real-world scenarios. Published on Monday, the study reveals a 90% decrease in infection rates two weeks after the second vaccine dose.
After enduring more than a year of pandemic challenges, this positive news is a much-needed relief. The findings indicate that the vaccines are effective against both symptomatic and asymptomatic infections, which is reassuring since real-world effectiveness can differ from clinical trial results. One dose alone was shown to prevent 80% of infections by two weeks post-shot, with the second dose increasing efficacy to 90%.
This information is crucial given ongoing debates within the scientific community regarding the potential for vaccinated individuals to transmit the virus through asymptomatic infections. The study suggests that this is unlikely.
Another concern has been the vaccines’ effectiveness against COVID-19 variants. Conducted between December 14, 2020, and March 13, 2021, the study occurred during a period when several concerning variants were prevalent, yet the vaccines maintained their effectiveness.
The study involved 3,950 participants, primarily those at high risk of exposure, including healthcare workers and first responders. None had previously contracted COVID-19. During the study, 62.8% of participants received both doses, while 12.1% had one dose.
Participants conducted weekly nasal swabs for PCR testing, allowing researchers to identify both symptomatic and asymptomatic infections. Notably, 58% of infections occurred before symptoms developed, with only 10.2% of those infected remaining asymptomatic.
Here’s the standout statistic: among fully vaccinated participants, there were only 0.04 infections per 1,000 person-days, which equates to just 0.04 infections daily among 1,000 individuals. For those who received only one dose, the rate was still promising at 0.19 infections per 1,000 person-days.
In conclusion, Dr. Rachel P. Williams, CDC Director, stated, “This study shows that our national vaccination efforts are working.”
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Summary
The Pfizer and Moderna vaccines have proven to be highly effective in reducing COVID-19 infections in real-world settings, achieving a 90% reduction in risk two weeks after the second dose. The study involved high-risk individuals and found that the vaccines were efficacious even against circulating variants. This news supports the ongoing vaccination efforts across the country.