Seronegative Rheumatoid Arthritis in State Phase Manifesting as Rheumatoid Lung Associated with Co-Infection SARS-Cov-2 and Klebsiella Pneumoniae, In a Context of Probable Variable Expression Hypogammaglobulinemia. At the Intersection of Immunology a

Introduction: Pulmonary involvement during rheumatoid arthritis is frequent, severe, very polymorphic and is very often the site of a viral or bacterial superinfection. Observation: This article describes the case of a 54-year-old diabetic and asthmatic patient suffering from polyarthralgia and long-term fever, who was diagnosed with seronegative rheumatoid arthritis complicated by rheumatoid lung and associated with co-infection SARS-CoV-2 and Klebsiella pneumoniae was diagnosed. The article presents the therapeutic difficulties specific to this case in our context and also reviews the existing literature on the diagnosis and treatment. Conclusion: Rheumatoid lung is a serious and fatal complication of rheumatoid arthritis; a viral superinfection very often worsens the diagnostic prognosis.