[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

Login ] [ Contact Forum Admin ] [ Main index ] [ Search | Check update time | Archives: 1234567[8]910 ]
Subject: Actually the FACT is the CDC is advocating ALL Americans get vaccinated for COVID-19 as soon as you are eligible, as the vaccines are PROVEN safe and effective. ...

CDC link
[ Next Thread | Previous Thread | Next Message | Previous Message ]
Date Posted: Thursday, February 25, 11:31:10am
In reply to: Seriously, do some research 's message, "You're kidding, right? The CDC is telling people to NOT act as if the vaccine is a cure-all. In fact, one shouldn't assume a return to normal for at least the rest of the year!" on Thursday, February 25, 09:26:00am


Vaccine efficacy ...
The Pfizer and Moderna vaccines have shown astonishing ó and essentially equivalent ó degrees of efficacy, at least in the early stages after vaccination.

The Pfizer vaccine showed efficacy of 95% at preventing symptomatic Covid infection after two doses. The vaccine appeared to be more or less equally protective across age groups and racial and ethnic groups.

The Moderna vaccine was 94.1% effective at preventing symptomatic Covid-19, after the second dose. The vaccineís efficacy appeared to be slightly lower in people 65 and older, but during a presentation to the Food and Drug Administrationís advisory committee in December, the company explained that the numbers could have been influenced by the fact there were few cases in that age group in the trial. The vaccine appeared to be equally effective across different ethnic and racial groups.

But comparing efficacy in those vaccines to the efficacy of Johnson & Johnsonís is challenging because of differences in the designs of the Phase 3 clinical tests ó essentially the trials were testing for different outcomes. Pfizerís and Modernaís trials were testing for slightly different criteria, with Pfizer counting cases from seven days after receipt of the second dose of vaccine and Moderna waiting till day 14 to start counting cases. Both tested for any symptomatic Covid infection.

J&J, by contrast, sought to determine whether one dose of its vaccine protected against moderate to severe Covid illness ó defined as a combination of a positive test and at least one symptom such as shortness of breath, beginning from 14 or 28 days after the single shot. (The company collected data for both.)

Because of the difference in the trials, making direct comparisons is a bit like comparing apples and oranges. Additionally, Pfizer and Modernaís vaccines were tested before the emergence of troubling new variants in Britain, South Africa, and Brazil. Itís not entirely clear how well they will work against these mutated viruses.

The J&J vaccine was still being tested when the variants were making the rounds. Much of the data generated in the South African arm of the J&J trial involved people who were infected with the variant first seen in South Africa, called B.1.351.

The J&J one-dose vaccine was shown to be 66% protective against moderate to severe Covid infections overall from 28 days after injection, though there was variability based on geographic locations. The vaccine was 72% protective in the United States, 66% protective in South America, and 57% protective in South Africa.

But the vaccine was shown to be 85% protective against severe disease, with no differences across countries (eight) or regions (three) in the study, nor across age groups among trial participants. And there were no hospitalizations or deaths in the vaccine arm of the trial after the 28-day period in which immunity developed. Itís not yet known if any of these vaccines prevent asymptomatic infection with the SARS-CoV-2 virus. Nor is it known if vaccinated people can transmit the virus if they do become infected but donít show symptoms.

[ Next Thread | Previous Thread | Next Message | Previous Message ]

[ Contact Forum Admin ]

Forum timezone: GMT-8
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.