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& #39;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& #39;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 https://abs.twimg.com/emoji/v2/... draggable="false" alt="👉" title="Right pointing backhand index" aria-label="Emoji: Right pointing backhand index"> http://bit.ly/3bE1l9g 

WHO">https://bit.ly/3bE1l9g&q... 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 herehttps://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Down pointing backhand index" aria-label="Emoji: Down pointing backhand index">
To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable=" title="To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Down pointing backhand index" aria-label="Emoji: Down pointing backhand index">">
To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable=" title="To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Down pointing backhand index" aria-label="Emoji: Down pointing backhand index">">
To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable=" title="To avoid further confusion, we are taking down the previous thread on the #COVID19 "immunity passport", but you can still see it herehttps://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Down pointing backhand index" aria-label="Emoji: Down pointing backhand index">">
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