Actually the theory is even older, here's an article from the beginning of April: https://www.radboudumc.nl/en/nieuws/2020/radboudumc-researchers-publish-new-in

Actually the theory is even older, here's an article from the beginning of April: https://www.radboudumc.nl/en/nieuws/2020/radboudumc-researchers-publish-new-insights-into-covid-19 https://www.radboudumc.nl/en/nieuws/2020/radboudumc-research... If this info has been out since 5 months I'd expect several trials already that target the bradykinin storm.