Pfizer, Moderna vaccines reduce risk of infection by 91 percent: US CDC

Pfizer, Moderna vaccines reduce risk of infection by 91 percent: US CDC

WASHINGTON: Taking two doses of mRNA-based vaccines from Pfizer-BioNtech and Moderna, authorized by the Food and Drug Administration, can reduce the risk of coronavirus infection by 91 percent, according to a new study by the US Centers for Disease Control and Prevention. Prevention (CDC).
Even a single dose of mRNA vaccines can reduce the risk of infection by up to 81 percent. These estimates included symptomatic and asymptomatic infections.
“Covid-19 vaccines are an important tool in overcoming this pandemic,” said CDC Director Rochelle P. Valensky.
“Findings from the extended time frame of this study provide evidence that mRNA COVID-19 vaccines are effective and should prevent most infections – but that fully vaccinated people who still get COVID-19 , they are more likely to have milder, shorter illness and be less likely to spread the virus to others. These benefits are another important reason for vaccination,” Valensky said.
The study also showed that mRNA vaccination benefits those who are fully vaccinated (14 or more days after dose 2) or partially vaccinated (14 or more days after 1 to 13 days after dose 2) ) despite getting Kovid-19.
People who were fully or partially vaccinated developed COVID-19, who were on average six days less sick and two days less sick. Those who were not vaccinated had a nearly 60 percent lower risk of developing symptoms such as fever or chills. Some study participants infected with SARS-CoV-2 did not develop symptoms.
People who were fully or partially vaccinated and then got COVID-19 had 40 percent less detectable virus in their nose (ie low viral load), and virus was detected in less than six days (ie. viral shedding). For those who were not vaccinated when they became infected. This means they were also less likely to spread the virus to others.
In addition, people who were partially or fully vaccinated were 66 percent less likely to test positive for SARS-CoV-2 infection for more than a week compared to those who were not vaccinated. happened.
The CDC said that although these indicators are not a direct measure of a person’s ability to spread the virus, they are correlated with a lower prevalence of other viruses, such as varicella and influenza.
For the study, 3,975 participants completed weekly SARS-CoV-2 testing for 17 consecutive weeks (from December 13, 2020 to April 10, 2021) in eight US locations.
Participants self-collected nasal swabs that were laboratory tested for SARS-CoV-2. If the tests came back positive, the samples were further tested to determine the amount of viral load and viral shedding.

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