Vaccines against Covid-19, developed by Pfizer / BioNTech SE and Moderna reduced the risk of 80% two weeks or more after the first of the two doses, according to the data obtained from a survey, in real, to vaccinated health workers and rescuers in the US, which was released today……..
The risk of infection was reduced by 90% within two weeks of the second dose, according to the sample study almost 4.000 people.
Research by the US Centers for Disease Control and Prevention (CDC) evaluated the ability of vaccines to protect against infection, including asymptomatic infections. Previous clinical trials by companies have evaluated the effectiveness of vaccines in preventing Covid-19 disease..
"This research shows that national vaccination efforts are working", pointed, in an announcement, CDC director Rochelle Wallenski.
Findings from use, in real, of these mRNA vaccines confirm the findings recorded in clinical trials, largely controlled, conducted before the US Food and Drug Administration gave the green light for emergency use.
The study investigated the effectiveness of mRNA vaccines in 3.950 participants in six states for a period 13 weeks, from its 14th of December 2020 until its 13th of March 2021.
"Approved COVID-19 mRNA vaccines were delivered early, significant protection, in real, against infection for the country’s healthcare staff, rescuers and other frontline workers ", stressed Walenski.