According to the “CDC”, it has banned both vaccines, which work with “technology” mRNA”
90 percent of infections 2 weeks after receiving the second dose.
After one dose of either vaccine, the risk of infection with the virus among the participants decreased by 80 percent after two or more weeks of vaccination.
The study investigated 3,950 healthcare workers, first responders, and other essential workers, and required them to collect nasal swabs each week for testing.BCR“For 13 consecutive weeks, regardless of whether they had symptoms of the disease.”
The Centers for Disease Control said it chose those groups because they are more vulnerable to the virus than the general population.
Self-scanning once a week allowed searching for evidence of virus infection SARS-Cove-2Regardless of the symptoms, according to the “CDC”, only 10.7 percent of the injuries during the study were without symptoms.
The majority of infections occurred before symptoms appeared or people were known to have them, which is the time when they were most likely to spread the virus.
The results of the Centers for Disease Control study are consistent with Pfizer research on data issued from Israel, which also found that the vaccine is highly effective against infection. Covid-19 Asymptomatic.
The results are also consistent with the two companies’ Phase III clinical trials, which were conducted before the vaccines received emergency use authorization from the US Food and Drug Administration.
And those showed Clinical trials Strong effectiveness against the virus, which means that people did not develop serious symptoms of the disease, but it was not clear whether the vaccines had actually prevented the person from becoming infected.
Preventing asymptomatic and pre-symptomatic infections by vaccinating health-care workers and other essential workers can help prevent spreading COVID-19 to those they care for or serve.
Director Centers for Disease Control and PreventionRochelle Wallinsky, said the study shows “that our national immunization efforts are successful,” and added in a statement that the two vaccines provide early and significant protection “against infection” for our country’s health care workers, first responders, and other key frontline workers.
Wallinsky noted that these results “should give hope to the millions of Americans who receive Covid-19 vaccines every day, and to those who will have the opportunity to roll their sleeves and receive the vaccination in the coming weeks,” and stressed that “licensed vaccines are the main tool that will help end this.” Devastating epidemic. “
The results may have a role in the debate about whether it is safe to delay the second dose of vaccines to give the first dose more quickly to a greater number of people, as the two doses of the “Pfizer” vaccine are given with an interval of 21 days, while the two doses of the “Moderna” vaccine are given 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 vaccine.PfizerAmong health care providers.
Studies conducted in the United Kingdom and Israel showed that a single dose was about 70 percent and 60 percent effective, respectively, against infection with the SARS-Cove-2 virus that causes Covid-19.
The agency said that the results confirm that the vaccine helped people develop protection from the virus two weeks after their first dose, but the greatest protection was observed among those who received the two recommended doses of the vaccine, which “supports” the CDC’s recommendation to receive two doses.