Direct Latest news about the coronav
Health The WHO assures that the Covid is the "first cause of death in Europe"
Coronavirus Prisoners of the persistent Covid: "We are no longer the people we used to be"
Numerous studies document that
coronavirus
vaccines
are not neutralizing and immunity decreases over time. A recently published study in the
British Medical Journal
conducted on
80,000 people in Israel
, one of the first countries in the world to start the vaccination campaign, but which saw a resumption of infections in December 2020, confirms this trend.
The study has found that the
Pfizer vaccine
provides excellent protection in the first weeks after vaccination, but
the risk of contagion for those vaccinated in all age groups begins to increase 90 days after the second dose
and increases each time. more as time goes on.
The results
The study was conducted by researchers at
Leumit Health Services
and is based on the examination of electronic medical records of 83,057 adults (
mean age 44 years
) who between May and September underwent a molecular smear at least three weeks after the second dose of vaccine and who
had never before shown signs of SarsCoV2 infection
.
Those who had contracted Covid before the study and those who had already received the third dose of the vaccine were excluded.
The results show that 7,973 participants
(9.6% of the total) tested positive for the swab
, almost all with
the Delta variant
.
The analysis shows that after the second dose of the vaccine, the positivity rate increases over time:
1.3% between 21 and 89 days.
2.4% between 90 and 119 days.
4.6% between 120 and 149 days.
10.3% between 150 and 179 days.
15.5% after 180 days.
Compared to the first 90 days after the second dose of vaccine, the risk of infection is
2.37 times higher after 90-119 days
, 2.66 times higher after 120-149 days, and 2.82 times higher after 150 days.
The researchers acknowledge that the interpretation of the data is limited by the observational design of the study and that
the influence of other factors not considered in the analysis
, such as virus strain, number of family members, and density
cannot be excluded.
of population. The analysis was designed to estimate the effect of time since
vaccination
on the risk of contagion and did not assess the severity of these "breakthrough" infections in terms of need for hospitalization, mechanical ventilation, and mortality.
In any case, the study
was conducted in a large number of people who received the same vaccine
, so the results are robust enough to conclude that the protection induced by the two doses of
Pfizer-BioNTech
vaccine
decreases with time. and the risk of contagion increases gradually after the first three months.
The results suggest that consideration of a
third dose of the vaccine
may be warranted in the
near future.
In Italy, it has just been decided to proceed with the third dose for everyone over 18 years of age at least 5 months after the second dose.
According to the criteria of The Trust Project
Know more
Covid 19
Coronavirus
Science and Health
Vaccines
Covid passport, the legal tool to limit the activities of the unvaccinated
SaludEspaña, one step away from returning to medium risk after rising more than three points in one day
Health The incidence reaches almost 112 cases after rising more than seven points in one day
See links of interest
The Palm
Last News
What
2022 business calendar
Christmas Lottery 2021
Search Christmas lottery number
Covid passport
Holidays 2021
Loteria del Niño 2022
How to claim insurance damages
Black friday
Spartak Moscow - Napoli
Besiktas - Ajax
Internazionale - Shakhtar Donetsk
Atlético de Madrid - Milan
Club Brugge - RB Leipzig