SARS-COV-2 infection is responsible for a potentially severe primarily respiratory infection called COVID19. A large proportion of patients, in particular in severe forms, present with thrombotic manifestations (DVT, EP, stroke, thrombosis of dialysis circuits, etc.). A significant proportion is also a carrier of circulating anticoagulant (ACC or LA), making it possible to suggest a diagnosis of APS. This type of autoantibody results in a spontaneous prolongation of the TCA uncorrected by a control serum therefore is quickly diagnosed using standard hemostasis The objective of this study is to describe the diagnosis of thrombotic complications in COVID19 patients presenting a positive lupus anticoagulant type test (LA) or aPL and the associated clinical and biological elements that may have favored thrombosis.

Inclusion criteria:

• Adult patient (≥18 years old)
• Patient taken care of in the SMO pole or the NHC surgical resuscitation service or hospitalized or consultant to the HUS between 01/03/2020 and 31/05/2020
• Patient infected with Covid-19, with a documented infection, having presented a documented thrombosis (arterial or venous), with an LA or aPL in the thrombosis assessment
• or Patient infected with Covid-19, with a documented infection, without documented thrombosis (arterial or venous), with in the standard work-up an increase in TCA revealing the presence of LA
• Subject having given his agreement for the reuse of his data for the purposes of this research

Exclusion criteria:

• Subject having expressed opposition to participating in the study
• Subject under guardianship or guardianship
• Subject under safeguard of justice

Major patient infected with Covid-19, with a documented infection, having presented a documented thrombosis (arterial or venous), with an LA or aPL in the thrombosis assessment