It warns against governments considering issuing so-called "immunity passports" to people who have had Covid-19, provided they are safe to resume normal life.
"At this point in the pandemic, there is not enough evidence of the effectiveness of antibody-mediated immunity to guarantee the accuracy of an & # 39; immunity passport & # 39; or & # 39; risk-free certificate, & # 39; so WHO.
During a briefing on Friday, the Infectious Disease Society of America warned that not enough antibody testing is known to take on immunity.
Dr. Mary Hayden, IDSA spokesperson and head of the Infectious Diseases Department at Rush University Medical Center, said: "We don't know if patients who have these antibodies still risk re-infection with Covid-19 or not. Points, I think we have to assume that they can risk reinfection. "
"We don't even know if the antibodies are protective, what degree of protection they provide, so it can be complete, it can be partial, or how long the antibodies last," Hayden added, "We know the antibody responses are slowing down."
Society "recommends that people with antibodies do not change behavior in any way, continue social distancing, etc. And we believe this is a very important point to emphasize because we are concerned that if this can be present, these antibodies can be misinterpreted , people can put themselves at unnecessary risk, "Hayden said.
CNN's Amanda Watts contributed to this report.