COVID-19

Third dose of anti-Covid vaccine: what duration of protection does it offer?

VACCINATION – La Haute Autorité de Santé has given the green light to a third dose, in France, for those over 40 years of age. But what duration of immunity does this booster vaccine grant?

If you’ve been vaccinated with two doses, here’s how your protection changes over time: A curve showing TF1 20H in the video at the top of this article, based on data from the New England Journal of Medicine, shows that protection against the risk of developing a severe form decreases after six months.

Protection against the risk of contracting Covid falls further during the same period. Thus, at six months, the efficacy of the vaccine against infection increases from 88% to 47%.

All the information about

France affected by a fifth wave of Covid-19

From this observation arises the interest in the third dose. Because scientists have shown that it could strengthen our immunity. “The third dose greatly modifies the immune response and bounces it completely. This awakening of immune memory is so strong that protection is probably seen as early as 48 hours after this vaccine,” explains Christine Rouzioux, Professor Emeritus. of virology at the Academy of Medicine and Pharmacy.

More specifically, it is as if the patient is teaching his body a recipe to defend itself against the virus. During the first two injections, your cells will first have to learn the procedure for making antibodies. By the end of the third, they already know the recipe and will therefore produce more quickly and in greater numbers.

The example of Israel

Thus, an Israeli study of nearly 1.5 million people observed, in the weeks after the third dose, a 93% drop in the risk of ending up in hospital. But this vaccine booster could also act to keep us from getting contaminated.

Since July 2021, the Hebrew state has gradually opened the third dose to different categories of the population, according to age, starting with the elderly. For each age group, the number of cases decreased a few weeks after the start of the booster injections.

Immunity from a booster shot often lasts for several years.

But, for how long does this immunity to the virus increase? “At least six months. We can expect it to be more, perhaps on the order of a year. But here, of course, we are hypotheses”, analyzes Professor Elisabeth Bouvet, specialist in infectious diseases, president of the technical commission of vaccination of the Haute Autorité de Santé (HAS).

And to add: “We have models for the other infections that we remind ourselves of. And the immunity they give us lasts, in general, several years. In the case of the booster vaccine against Covid, we can wait.”

Read also

  • Covid-19: Vaccine Strategy Guidance Council paves the way for third dose for all adults
  • 3rd dose of vaccine: calendar, interested public, make an appointment … all about the withdrawal campaign against Covid-19

Either way, this immunity from the third dose will depend on how the virus progresses. Because a new variation could make the vaccine lose its effectiveness.

On the same topic

The most read articles

LIVE – Covid-19: Government to provide messenger RNA-free vaccines to caregivers in Guadeloupe

2021-11-23T06: 30: 00.000Z

United States: car driver crashing into crowd at Christmas parade charged with 5 homicides

2021-11-22T19: 26: 18.872Z

Covid-19: the Scientific Council recommends the return of the mandatory mask and the limitation of meetings

2021-11-22T15: 19: 58.159Z

Presidential: “Whoever works full time will receive at least 1500 euros net per month”, promises Xavier Bertrand

2021-11-22T21: 09: 32.389Z

Guadalupe: Emmanuel Macron considers the situation “explosive” and asks “not to give in to lies”

2021-11-22T11: 21: 16.222Z

LCI logo
defends the ambition of free, verified and accessible information to all thanks to advertising revenue.

To help us keep this service free, you can “change your choice” and accept all cookies.

MODIFY AND ACCEPT EVERYTHING

.

WeaPlay, WordPress Theme, Business Consulting Nulled, Avada 7.4 Nulled, Newspaper – News & WooCommerce WordPress Theme, Nulledfire, Elementor Pro Weadown, Astra Pro Nulled, Plugins, Rank Math Seo Pro Weadown, Woodmart Theme Nulled, Elementor Pro Weadown,Woodmart Theme Nulled, Wordfence Premium Nulled, Flatsome Nulled, Yoast Nulled, Woocommerce Custom Product Ad, Jannah Nulled, Dokan Pro Nulled, Fs Poster Plugin Nulled, Jnews 8.1.0 Nulled, PW WooCommerce Gift Cards Pro Nulled, Newspaper 11.2, Premium Addons for Elementor, Slider Revolution Nulled, Wpml Nulled, PHP Script, WP Reset Pro, Consulting 6.1.4 Nulled

Back to top button