Transient Platelet Satellitism and Cellular Phagocytosis Associated With Type A Influenza Virus Infection: A Case Report

Despite advancements in fifth-generation hematological analyzers, the microscopic examination of peripheral blood smears remains crucial for diagnosing thrombocytopenia. This study aims to report a rare case of transient platelet satellitism and cellular phagocytosis while emphasizing their clinical implications, particularly in the misdiagnosis of thrombocytopenia during viral infections. We present the case of a man with type A influenza infection-associated pneumonia and thrombocytopenia, in whom platelet satellitism formation and cellular phagocytosis were observed on a blood smear. Following appropriate diagnostic procedures, the platelet count was corrected, thereby preventing unnecessary therapeutic interventions and emphasizing the significance of accurate diagnostic techniques to avoid overtreatment. The simultaneous presence of platelet satellitism and cellular phagocytosis resolved after therapeutic measures. This case underscores the critical role of peripheral blood smear examination in the diagnostic process and calls for further research into the mechanisms behind platelet satellitism and cellular phagocytosis in viral infections. Accurate diagnosis is essential, particularly in distinguishing pseudothrombocytopenia, an in vitro artifact, from genuine medical conditions.