ISLN bear similarities to monoclonal B-cell lymphocytosis (MBL). Individuals with MBL usually present with unexplained increases in blood lymphocyte counts (i.e. lymphocytosis). The haplotype was further linked to false-tumor splenomegaly, CD8 lymphocytosis, and high IgG. The second stage is characterized by leukopenia, granulopenia, and progressive lymphocytosis. The requisite lymphocytosis of this disease is typically 2-20x10/L. HLA-DQ8 haplotypes, negative serology, and normal histology or duodenal lymphocytosis had celiac disease. The opposite is lymphocytosis, which refers to an excessive level of lymphocytes. Diffuse infiltrative lymphocytosis syndrome occurs in HIV positive patients with low CD4 counts. Eventually, PT causes lymphocytosis, one of the systemic manifestations of whooping cough. When the percentage of lymphocytes exceeds 40%, it is recognized as relative lymphocytosis. Pertussis toxin causes lymphocytosis by an unknown mechanism. The lymphocytosis persisted for several months and lymphadenopathy was apparent in the subcutaneous lymph nodes. Lymphocytosis is a feature of infection, particularly in children. Lymphocytosis is an increase in the number or proportion of lymphocytes in the blood.