在病毒性脑膜炎与脑膜脑炎患者脑脊液(CSF)中发现大量萤淋巴细胞与少量嗜中性细胞或吞噬细胞早已有认识.然而,在急性或亚急性疾病过程中在脑脊液中许多不常见细胞,即反应性或“不典型”淋巴细胞以及形成抗体的浆细胞,也屡有报导.关系到淋巴细胞活性的其他形态学发现如有丝分裂, It has long been recognized that a large number of firefly lymphocytes and a few neutrophils or phagocytes are found in cerebrospinal fluid (CSF) of patients with viral meningitis and meningoencephalitis.However, many uncommon cells in cerebrospinal fluid during acute or subacute disease , Reactive or “atypical” lymphocytes, and antibody-producing plasma cells have also been reported for many other morphological changes that are related to lymphocyte activity such as mitosis,