標題: Moderna COVID-19 vaccines highly effective even
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註冊 2020-9-7
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發表於 2021-3-30 18:15 
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Pfizer, Moderna COVID-19 vaccines highly effective even after first shot in real-world use: US study


COVID-19 vaccines developed by สล็อต ทุน น้อย กำ ไร ดี Pfizer with BioNTech and Moderna
reduced the risk of infection by 80 per cent two weeks or more after the first of two shots,
according to data from a real-world study of vaccinated US healthcare personnel and first
responders released on Monday (Mar 29).


The risk of infection fell 90 per cent by two weeks after the second shot, the study of just
under 4,000 people found.


The study by the US Centers for Disease Control and Prevention (CDC) evaluated the vaccines'
ability to protect against infection, including infections that did not cause symptoms.
Previous clinical trials by the companies evaluated their vaccine's efficacy in preventing illness
from COVID-19.


"This study shows that our national vaccination efforts are working,” CDC Director Rochelle
Walensky said in a statement.


The findings from of the real-world use of these messenger RNA (mRNA) vaccines confirm
what was seen in large controlled clinical trials conducted before they received emergency
use authorizations from the US Food and Drug Administration.


The study looked at the effectiveness of the mRNA vaccines among 3,950 participants in
six states over a 13-week period from Dec 14, 2020 to Mar 13, 2021.


"The authorized mRNA COVID-19 vaccines provided early, substantial real-world protection
against infection for our nation’s healthcare personnel, first responders, and other frontline
essential workers,” Walensky said.


The new mRNA technology is a synthetic form of a natural chemical messenger being used to
instruct cells to make proteins that mirror part of the novel coronavirus. That teaches
the immune system to recognize and attack the actual virus.