Earlier today we tweeted about a new WHO scientific brief on "immunity passports". The thread caused some concern & we would like to clarify:

We expect that most people who are infected with #COVID19 will develop an antibody response that will provide some level of protection.

What we don't yet know is the level of protection or how long it will last. We are working with scientists around the world to better understand the body's response to #COVID19 infection. So far, no studies have answered these important questions.

As new evidence becomes available, WHO will update this scientific brief http://bit.ly/3bE1l9g 

WHO recommends that all individuals follow public health guidelines.

Thank you @NateSilver538, @dylanhmorris, @drannehuang, @ericMstrauss, @Laurie_Garrett and others for your constructive input.

To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it here