After several studies carried out in South Africa and the United Kingdom, the United Kingdom Health Security Agency, the British health agency, published the results of the latter at the end of last week, relayed by Le Figaro, highlighting – cautiously – a decrease in the efficacy of the vaccine against the Omicron variant, which is increasing in the world.
The agency explains that the Pfizer-BioNTech vaccine would decline after ten weeks from injection.
But these results only refer to the vaccine doses from the Pfizer-BioNTech laboratories, explaining that the vaccination schedule of the three doses of the vaccine would establish a protection of 70% against the symptoms of the virus, before falling seriously, reaching 45% at ten. weeks.
However, the situation changes when patients have received a “mixture”, that is, vaccines from different laboratories. If the patient receives a first dose of AstraZeneca, then a booster dose of Moderna or Pfizer-BioNTech, the protection would approach, after ten weeks, 45% and 35%.
But the efficacy of the vaccine can otherwise be maintained at 70-75% if people have first injected two doses of Pfizer-BioNTech before a booster of the Moderna vaccine.
However, the study specifies that the reaction and the guarantee of the vaccine may vary depending on the patient’s profile, and recalls that the sample used for this study, made up of 147,587 cases of the Delta variant and 68,489 of the Omicron variant, continues being limited. specifies that these results should be viewed with caution because the study remains “highly uncertain due to the low number of Omicron-affected patients currently in the hospital, the inability to effectively measure all previous infections, and the low spread of ‘Omicron among patients. older age groups’.
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