The laboratory tests performed on the day of admission pointed out microcytic anemia (hemoglobin 10.7 g/dL, medium erythrocyte volume 75.9 fL), low erythrocyte count (3.99 × 106/μL), neutropenia (1,070/μL), a normal count of leukocytes (8,250/μL) and lymphocytes (2,540/μL), and a C-reactive protein (CRP) of 2.2 mg/L. Here, CRP is linked to neutropenia.