Laboratory data revealed the following: white blood cells, 52,310 cells/μl with 46.3% neutrophils and 45.4% eosinophils; 13.3 g/dl hemoglobin and 242,000 cells/μl platelets; renal functional insufficiency with 36 mg/dl blood urea nitrogen (BUN) and 1.4 mg/dl creatinine; a routine stool test revealed no evidence of parasite infection; immunoglobulin E level was 99.1 IU/ml and the levels of tumor markers in the blood, including carcinoembryonic antigen (CEA; 6.47 ng/ml) and cancer antigen (CA) 19-9 (49.81 U/ml), were elevated. Here, CEACAM5 is linked to parasitic infectious disease.