A study conducted by the US Centers for Disease Control and Prevention of nearly 4,000 participants showed that if two recommended doses are used at the same time, Pfizer and Moderna vaccines can effectively reduce infections by up to 90%. The protection rate of a single dose is 80%.
A single dose of Pfizer and Moderna covid-19 vaccine can effectively prevent infection.By supply Two recommended doses, The efficiency is increased to 90%.These data come from A study published on Monday By the Centers for Disease Control and Prevention (CDC(English)).
“I am happy to share information about this new research. […] The Director of CDC announced: “This product has evaluated the effectiveness of Pfizer and Moderna vaccines in preventing infections” Rochelle Volensky, At the press conference.
This effect was observed two weeks after the first dose was given to the subjects in the study. 3,950 health workers Between December 14th and March 13th. Every week, regardless of whether symptoms are present or asymptomatic, routine tests are performed to detect SARS-CoV-2 infection in volunteers.
Lower incidence among vaccinated people
Of all volunteers who must have no history of COVID-19 infection, 62.8% (2,479) received two recommended doses, while 477 (12.1%) received only one dose of the vaccine. The remaining participants were not vaccinated.
Among the unvaccinated people, the infection incidence rate per 1,000 volunteers was 1.38, while the infection rates for fully vaccinated or partially vaccinated people were 0.04 and 0.19 per 1,000 people, respectively.
They were notified 8 cases of infection confirmed by PCR Among the patients who received the full regimen of vaccination, partial immunity (one dose) and the other 3 infections.For the authors, these findings indicate that a licensed mRNA vaccine Effectively prevent infection Regardless of the symptoms, SARS-CoV-2 can be used for evaluation.
“These temporary results […] Prove that current vaccination efforts can bring substantial preventive benefits to working-age adults. They reinforce the CDC’s recommendation on the use of mRNA vaccines for complete two-dose immunizations. All candidates are advised to use the covid-19 vaccine“,get conclusion.
Thompson MG et al. “Interim estimates of vaccine efficacy of BNT162b2 and mRNA-1273 COVID-19 vaccines in preventing SARS-CoV-2 infection among medical staff, first responders, and other basic and frontline workers.” MMWR Morb Mortal Wkly Rep. (2021)