(CNN)You can catch it more than once.
The World Health Organization has warned against the idea that coronavirus immunity passports can provide a safe way out of lockdown.
Many countries were hoping to start issuing risk-free certificates to people who have had the disease, allowing them to return to work, travel and go about their business. The plan was based on the assumption that Covid-19 survivors develop immunity.
But yesterday the WHO said no evidence exists that people who have recovered from the disease and developed antibodies are protected from catching it again.