There is currently no evidence that people who have recovered from COVID-19 are protected from a second infection, the World Health Organization warned Saturday as the worldwide death toll topped 200,000.The health body tweeted that it was continuing to review the evidence on antibody responses to COVID-19, adding that most studies suggest that people who have recovered from the infection have antibodies to fight the virus.”However, some of these people have very low levels of antibodies in their blood,” it said.It also advised against the use of so-called “immunity passports,” which have been mooted in some countries as a way to enable people to travel or return to work on the assumption that they are immune to the virus.At this point in the pandemic, the WHO said, there is not enough evidence about the effectiveness of antibody-mediated immunity to guarantee the accuracy of such passports or “risk-free” immunity certificates.Let our news meet your inbox. The news and stories that matters, delivered weekday mornings.Most people who are infected with COVID-19 will develop an antibody response that will provide “some level of protection,” it later clarified, but it does not yet know what that level is or how long the immunity will

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