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(CNN) – The World Health Organization cautions that people who have had coronaviruses are not necessarily immune because of the presence of antibodies to contract the virus again.
“There is still no evidence that people who have had covid-19 do not get a second infection,” the WHO said in a new scientific report.
The WHO issues a warning to governments that issue “immunity passports” to people who have had covid-19, assuming they are safe to resume normal life.
“At this point in the pandemic, there is insufficient evidence about the effectiveness of antibody-mediated immunity to ensure the accuracy of a ‘immunity passport’ or ‘risk-free certificate,'” the report says.
The WHO published these data as a guide for adjusting public health and social measures for the next phase of the covid-19 response.
“People who assume they are immune to a second infection because they have received a positive test result may ignore public health advice. Therefore, such certificates can increase the risks of continuous transmission, “reported the WHO.
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The health agency says it is reviewing evidence about antibody responses to SARS-CoV-2, the virus that causes the covid-19 infection. The report says “most” of the studies show that people who have “recovered from an infection have antibodies to the virus.”
But until yesterday, no study has “evaluated whether the presence of antibodies against SARS-CoV-2 confers immunity to subsequent infection by this virus in humans.
