Anti-vaxxers are making a false claim about the first vaccine dose. We debunk it
Contrary to what misinformers claim, the first dose of the Pfizer vaccine does give you protection against Covid, and a second dose gives even more
A South African news site, Biznews, that has become notorious for promoting misinformation about Covid has published an article that makes numerous misleading and false claims.
Biznews is not a member of the South African Press Council and therefore not subject to press ombudsman complaints or rulings.
The Biznews article explicitly states that immediately after being vaccinated with the first dose people are placed at greater risk of contracting Covid. The article specifically mentions the Pfizer and AstraZeneca vaccines in this regard. (Since the Pfizer vaccine is being used in South Africa, we deal only with that here.)
The claim is nonsense and it is firmly debunked by a study published in the world’s leading medical journal, the New England Journal of Medicine, last week. The study authors are the scientists who tested the BioNTech/Pfizer vaccine. This is the most widely used vaccine in South Africa. The study presents the six-month data of the clinical trial that found this vaccine to be safe and effective.
The Pfizer vaccine protocol involves having two doses several weeks apart.
The trial volunteers were randomly divided into two nearly equally sized groups: those who got the vaccine and those who got a placebo (a harmless substance that does nothing).
Between the first and second dose on the trial, 110 people on the placebo contracted Covid versus 46 vaccine recipients. This is a first dose vaccine efficacy of 58%. It’s not nearly as effective as efficacy after the second dose but it thoroughly debunks the myth that after the first shot you’re at greater risk of Covid.
Moreover, 30 of the 31 people on the trial who got severe Covid were in the placebo group. This thoroughly refutes the idea that you’re more at risk of Covid after your first dose.
Another important finding from the study was that vaccine efficacy against Covid was over 91% through six months of follow-up, albeit that there was a gradual decline in vaccine efficacy with time. “Vaccine efficacy against severe disease was 96.7%” the paper states. In South Africa, the vaccine was 100% effective over the duration of the study, though this was while the beta variant was dominant. Since then, the delta variant has become dominant here.
The authors concluded: “Through 6 months of follow-up and despite a gradual decline in … efficacy, [the vaccine] had a favourable safety profile and was highly efficacious in preventing Covid-19.”
Watch this video which explains how we know if vaccines and medicines are safe and effective:
Dodgy people are suing us. Please support us by contributing to our legal costs and helping us to publish news that matters.
Next: Activists demand SASSA fix “flawed” Covid-19 grant application process
Previous: Nurses return to Willowvale clinic after two-month absence
© 2021 GroundUp. This article is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.
You may republish this article, so long as you credit the authors and GroundUp, and do not change the text. Please include a link back to the original article.
We put an invisible pixel in the article so that we can count traffic to republishers. All analytics tools are solely on our servers. We do not give our logs to any third party. Logs are deleted after two weeks. We do not use any IP address identifying information except to count regional traffic. We are solely interested in counting hits, not tracking users. If you republish, please do not delete the invisible pixel.