 The investigators have demonstrated that the mean percentage of circulating CD8 regulatory T CD8 Tregs cells is significantly higher in patients with warm hemolytic anemia wAHAI in remission than in controls and is correlated to hemoglobin levels. In vitro, low dose of interleukine-2 IL2 induce the expansion of CD8 Tregs. The objective is to demonstrate that, over a 9 week treatment period; low doses of IL2 can induce the expansion of CD8Tregs in patients with active wAHAI. 