[ad_1]
There is no evidence that people who test positive in the diagnostic tests are immunized against the new coronavirus, the World Health Organization (WHO), considering that the so-called “Immunity passports” they can promote the spread of the pandemic.
“There is no evidence at this time that people who were cured of Covid-19 and who have antibodies are immunized against a second infection,” the WHO said in a statement.
“To date, no study has evaluated whether the presence of antibodies to SARS-Cov-2 (new coronavirus) confers immunity against future infection with this virus in humans,” he added.
Some governments have proposed that documents be established that prove people’s immunity based on serological tests that reveal the presence of antibodies in the blood, in order to lift the confinement; and gradually allow a return to work and the resumption of economic activity.
However, the efficacy of antibody immunity is not demonstrated at this time and the available scientific data do not justify the granting of an “immune passport” or a “certificate of absence of risk”, warned the WHO.
“People who believe they are immunized against a second infection because they tested positive may ignore public health recommendations. Resorting to this type of certificates could, consequently, increase the risks that the transmission continues, “he insisted.
Furthermore, the WHO considers that currently used serological tests “need additional validation to determine their accuracy and reliability.”
In particular, they must distinguish the immune response to the new coronavirus from the antibodies produced by an infection from another of the six known human coronaviruses, four of which cause benign colds and the other two are those of MERS (Middle East Respiratory Syndrome) and that of SARS (Severe Acute Respiratory Syndrome).
“People infected with one or the other of these viruses are capable of producing antibodies that interact with antibodies produced in response to the infection caused by SARS-CoV-2,” and it is therefore imperative to be able to identify them, he said.
[ad_2]
