Human immunoglobulin (Shandong Taibang)

Primary purpose: To evaluate the efficacy of intravenous human immunoglobulin in the treatment of primary immune thrombocytopenia (ITP) by improving the effective rate of platelets. Secondary purpose: 1) Observe and evaluate the efficacy through other secondary efficacy indicators; 2) Observe and evaluate safety, including clinical symptoms and signs observation and laboratory indicators, the incidence and severity of adverse events.