Experts at the World Health Organization have called on world governments that initiated the process of revaccination against the Corona virus to abandon that measure.
They suggested sending surplus vaccines to those countries where the proportion of vaccinated people is still low. The scientific journal The Lancet published their open letter in this regard.
“The vaccine reserves against the Coronavirus are still very limited. Even if boosting the immunity of people who have already been vaccinated is beneficial, this effect does not outweigh the benefits that humanity will reap from vaccinating the unvaccinated population,” the letter said.
“Abandoning revaccination will help us bring the epidemic closer,” said Anna Maria Henao Restrepo, head of the WHO’s Vaccine Development Programme.
The emergence of the Delta strain and other new types of coronavirus has raised fears that new versions of the virus will emerge in the near future that will resist the work of vaccines and the antibodies of people who have recovered. Such considerations made the authorities in many countries of the world think about achieving national programs to re-vaccinate the population. For example, the Israeli authorities first launched such a program in the late summer of 2021.
Inao Restrepo and her colleagues at the World Health Organization and other health organizations were interested in the extent to which these revaccination programs have a positive impact on the epidemiological situation in the world. They compared its pros and cons with what would have happened if surplus vaccines were sent to countries where the number of people vaccinated was still low or close to zero.
Scientists analyzed the results of studies conducted in recent months in a number of countries of the world and aimed at studying how the effectiveness of vaccines changes after the emergence of new forms of SARS-CoV-2. In addition, experts analyzed how quickly the effectiveness of vaccines declines over time.
The researchers came to the conclusion that all currently used vaccines, including RNA-based vaccines, are still effective, preventing humans from infection by 65-90% and protecting 80-100% of patients from dangerous COVID-19. This applies to all vaccinated patients, although the effectiveness of some vaccines declines rapidly over time.
On the other hand, unvaccinated people are still highly susceptible to infection. So scientists have proposed to expand the circle of people who receive vaccines against COVID-19 even further. This will require abandoning national revaccination programs and redirecting vaccines to areas of the world where they are not currently available.
According to WHO experts, such steps will effectively accelerate the eradication of the global COVID-19 epidemic and protect humanity from the emergence of new strains of SARS-CoV-2 that will be able to counteract antibodies and other forms of immunity.
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