TALLINN, Estonia — Estonia has started piloting a digital immunity passport that enabes a person to share one’s COVID-19 status with a third party, such as an employer or authorities.

The ImmunityPass mobile and web application collects coronavirus testing data. It’s created by a non-governmental organization supported by Estonian start-up entrepreneurs and medical officials.

Developers say on the app’s webpage it is compliant with Estonian and international data privacy regulations but acknowledge “we are well aware of possible ethical, societal and other bottlenecks and why this solution could not work” in some countries.

The World Health Organization has warned against issuing such immunity passports to people who have recovered from COVID-19 because there is no evidence they’re protected from a second infection.