This research focuses, in the media public sphere, on the modalities of construction and progressive visibility of persistent symptoms of certain forms of Covid-19, designated by the category "Long Covid". The aim is to analyze the process according to which this particular form of the disease appeared in the media in June 2020, was the subject of debates and contradictory - even conflicting - positions of the actors, until its institutional and public recognition in 2022. The article conducts a comparative analysis on the French national and regional press and on the digital social network Twitter.