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The results showed strong evidence that both vaccines work to prevent all types of infections, including asymptomatic and pre-symptomatic.
According to the “CDC”, it banned the two vaccines, which use “mRNA” technology
90 percent of infections 2 weeks after receiving the second dose.
After a dose of either vaccine, participants’ risk of infection with the virus was reduced by 80 percent after two or more weeks of vaccination.
The study surveyed 3,950 healthcare workers, first responders and other essential workers, and required them to collect nasal swabs every week for a BCR test for 13 consecutive weeks, whether or not they developed symptoms.
The Centers for Disease Control said it chose these groups because they are more vulnerable to the virus than the general population.
The weekly self-examination looked for evidence of infection with the SARS-Cove-2 virus, regardless of symptoms, and according to the “CDC”, only 10.7 percent of infections during study were asymptomatic.
The majority of infections occurred before symptoms appeared or before symptoms appeared, which is when they were most likely to spread the virus.
The results of the CDC study are consistent with Pfizer’s research on data from Israel, which also found the vaccine to be highly effective against asymptomatic Covid-19 infection.
The results are also consistent with the two companies’ Phase III clinical trials, which were conducted before the vaccines received emergency use clearance from the U.S. Food and Drug Administration.
And these clinical trials have shown high efficacy against the virus, meaning people did not develop severe symptoms of the disease, but it was not clear whether the vaccines actually prevented the person from becoming infected.
Preventing asymptomatic and pre-symptomatic infections by immunizing health workers and other essential workers can help prevent the spread of COVID-19 to those they care for or serve.
Centers for Disease Control and Prevention director Rochelle Wallinski said the study shows “that our national vaccination efforts are successful,” and added in a statement that both vaccines provide early and meaningful protection. ” against infection “for the health of our country. care workers, first responders and other key frontline responders. “.
Wallinsky noted that these results “should give hope to the millions of Americans who receive Covid-19 vaccines every day, and those who will have the opportunity to roll up their sleeves and get vaccinated in the weeks to come. “, and stressed that” licensed vaccines are the main tool that will help end this. “Devastating epidemic.”
The results may play a role in the debate over whether it is safe to delay the second dose of vaccine to deliver the first dose more quickly to more people, because the two doses of the “Pfizer” vaccine are administered 21 days apart, while the two doses of the “Moderna” vaccine are administered 28 days apart.
And the Centers for Disease Control acknowledged that the results were consistent with other recent studies of partial vaccination after the first dose of the “Pfizer” vaccine among health care providers.
Studies in the UK and Israel have shown that a single dose was approximately 70% and 60% effective against infection with the SARS-Cove-2 virus that causes Covid-19, respectively.
The agency said the results confirm that the vaccine helped people develop protection against the virus two weeks after their first dose, but the greatest protection was seen among those who received the recommended two doses of the vaccine, which “supports” the CDC’s recommendation to receive two doses.
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