Rome, 25 August 2021 – Waiting for a Covid vaccine for more recall effective against variants (already in the study), we are wondering these days about how long the immunization coverage lasts. Virologist Andrea Crisanti explains: “From what we see in Israel it lasts around 8-9 months”, while according to a recent British study, coverage decreases significantly after six months. Studies that seem to suggest the need for one third dose, as already happens in Israel and how it is anticipated by the minister Hope, who yesterday said: “It will be done, starting with the most fragile”. Already in mid-August the United States announced the need for one third dose for all after 8 months.
in the meantime Johnson & Johnson advocates a recall also for its single-dose vaccine, which generates anti-virus antibodies “nine times higher” than those seen four weeks after the single dose.
Vaccination obligation, the European Court of Human Rights rejects the appeal
The British study
The protection offered by the anti-Covid vaccines of the Pfizer-BioNTech e AstraZeneca decreases noticeably after six months, says the British study which then supports the need for a third dose. One month after the second dose the Pfizer vaccine is effective all‘88% in avoiding contagion, a fact that nevertheless comes down to 74% after five or six months; for AstraZeneca serum the data are respectively de77% and 67%.
The study conducted by King’s College London made use of a sample of over a million vaccinated who had downloaded the British equivalent of the “Immune” app. For this reason, it becomes necessary to evaluate the possibility of a third dose for the most fragile groups such as the elderly, the first to be vaccinated and whose protection in the winter months could be less than 50%.
Covid Bulletin of 25 August
J&J: We need a recall
Johnson & Johnson said this morning that lat booster dose of its Covid-19 vaccine has spawned a promising immune response in clinical studies performed on patients aged 18 to 55 years. The company said Wednesday that J&J recipients who received a booster dose of the vaccine generated anti-virus antibodies “nine times higher” than those seen four weeks after a single dose.
The immune response, according to the company, justifies a booster of the vaccine 8 months after the first dose. Johnson & Johnson did not clarify how the booster dose affects the delta variant of the coronavirus, however, he explained that he is working with the Food and Drug Administration to have the green light on the second dose of your vaccine.
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