it is in their document
W.H.O.’s Laboratory testing for coronavirus disease 2019 (COVID-19) in suspected human cases. Interim guidance 2 March 2020 on top right of page 4
https://apps.who.int/iris/bitstream...oratory-2020.4-eng.pdf?sequence=1&isAllowed=y
W.H.O.’s Laboratory testing for coronavirus disease 2019 (COVID-19) in suspected human cases. Interim guidance 2 March 2020 on top right of page 4
https://apps.who.int/iris/bitstream...oratory-2020.4-eng.pdf?sequence=1&isAllowed=y