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.

Read the rest of the story at NBC News