NEW COVID 2022 VACCINE. The vaccination campaign with the new Covid vaccines will start on Monday, October 3. These bivalent vaccines (two from Pfizer, one from Moderna) this time target the Omicron variant.
[Updated September 30, 2022 at 12:28 p.m.] The vaccination campaign with the new Covid vaccines will begin on Monday, October 3 announced Health Minister François Braun on September 27 on France info . These three vaccines have been authorized in France by the High Authority of Health after being validated by the European Medicines Agency ( MOTHER ) on September 1. Two are produced by Pfizer, the other by modern . The difference compared to previous Covid vaccines: their targeting of variant Omicron . These are therefore adapted versions of the vaccine original Comirnaty (Pfizer/BioNTech) et Spikevax (Modern). These new vaccines can only be used for 'booster' doses (3rd or 4th) not for the first vaccination. Who are they for? In first vaccination? For the 3rd dose of vaccine? The 4th dose ? What is their efficiency ?
The three new Covid vaccines authorized in France in September and available from October 3 are variations of the Covid vaccines from the Pfizer and Moderna laboratories:
These vaccines are adapted versions of the original Comirnaty vaccines (Pfizer/BioNTech) et Spikevax (Modern) for target Omicron's BA1, BA4 and BA5 sublines in addition to the original SARS-CoV-2 strain . That's why they say ' bivalents “while the vaccines used in primary vaccination are said to be “monovalent” because they only target the original strain of the virus. The new vaccines have the same principle of action: each contains mRNA molecules ( RNA messager ) who have instructions for make the spike proteins of SARS-CoV-2 original and of the Omicron BA.1 or BA4-BA5 sub-variant. The spike protein is a protein on the surface of the virus that the virus needs to enter body cells and may differ between variants of the virus. By adapting the vaccines, the objective is to broaden the protection against the different variants. When a person receives one of these vaccines, some of their cells read the mRNA instructions and temporarily produce the spike proteins. The person's immune system then recognizes these proteins as foreign and activates natural defenses – antibodies and T lymphocytes – against them. If the vaccinated person later comes into contact with the virus, the immune system recognizes the spike protein on its surface and prepares to attack it. Antibodies and immune cells can protect against COVID-19 by working together to kill the virus, preventing its entry into cells in the body, and destroying infected cells.
A bivalent vaccine is a vaccine that has two valencies . A valence is the part of a vaccine corresponding to protection against a single germ. A bivalent vaccine protects against 2 diseases or 2 germs causing the same disease . The bivalent Covid vaccines thus protect against the initial strain of the Sars-CoV-2 coronavirus and against the Omicron variant of this virus. We can also have 'multivalent' vaccines which protect against several germs causing the same illness or against different illnesses ( like the vaccine ROR which protects against measles, mumps and rubella ).
The Haute Autorité de Santé has designated the new vaccines under the names: Comirnaty Original/Omicron BA.1, Comirnaty Original/Omicron BA.4 -5, Spikevax bivalent Original/ Omicron BA.1.
Two new vaccines developed by the American laboratory Pfizer-BioNTech target for one the BA.1 Omicron sub-lineage and for the other the BA4-BA5 sub-lineages. They are based on the original vaccine against Covid, Comirnaty (the most administered in France since 2020). They contain 15 µg of mRNA coding for the SARS-CoV-2 spike protein, which is present in the original Pfizer vaccine and 15 µg of mRNA encoding the Omicron BA.1 or BA4/BA5 subvariant spike protein . Other than the addition of the spike protein mRNA sequence, all other components of the vaccine remain unchanged.
The new vaccine developed by the American laboratory Moderna targets the BA.1 Omicron sublineage. It contains 25 mcg of the currently authorized booster (Spikevax/mRNA-1273) and 25 µg of Omicron BA1 subvariant . A study has enabled its validation. She wore on more than 800 adults aged 18 and over . The study found that a booster dose of bivalent Spikevax Original/Omicron BA.1 induced stronger immune response against SARS-CoV-2 strain and Omicron BA.1 subvariant compared to a booster dose of the original Spikevax vaccine.
These new Covid vaccines are aimed at people at risk of severe forms of Covid. They are authorized in persons aged 12 years and over who have received at least one primary vaccination course against Covid-19, regardless of the vaccines used at the time. They are authorized only for a utilization in abseiling dose . The population groups to be targeted for this additional dose of vaccine according to HAS recommendations are:
For people under 30 , HAS maintains its recommendation to only use Comirnaty® vaccines (Pfizer BioNTech).
A interval of at least 3 months must be respected between the administration of these new vaccines and the last dose of vaccine against COVID-19 previously received.
They also cover protection against BA.5 and the Centaur variant.
'The expected clinical efficacy for these new bivalent vaccines is at least equivalent or even superior to that of the original vaccines monovalent, without this probable superiority being able to be currently demonstrated in real life' indicated the HAS in its press release of September 20.
The tolerance of these vaccines 'is identical to that of monovalent vaccines' inform the HAS. Side effects observed with vaccines targeting Omicron were 'comparable to those seen with the original vaccines and were generally mild and short-lived' indicate l'EMA.
Covid-19: HAS includes bivalent vaccines in the vaccination strategy for the fall. Press release, September 20, 2022
ECDC-EMA statement on booster vaccination with Omicron adapted bivalent COVID-19 vaccines. EMA. 6 septembre 2022.
Pfizer and BioNTech Receive Positive CHMP Opinion for Omicron BA.1-Adapted Bivalent COVID-19 Vaccine Booster in European Union. Pfizer, 1er septembre 2022
EMA CHMP adopts positive opinion recommending authorization for the use of Moderna's Omicron-Targeting Bivalent Booster in the European Union, Moderna, 1er septembre 2022.Source journaldesfemmes.fr