Blood tests for pertussis are mainly characterized by lymphocytosis, and the total number of leukocytes may also be increased, but a nasopharyngeal swab culture of Bordetella pertussis is the main method of confirming the diagnosis.
When the patient suffers from pertussis, a blood test blood routine can show the result of leukocytosis, up to (20~50)×10^9/L, and characterized by lymphocytosis, lymphocytes can account for 60%~80%, and most of them are mature small lymphocytes.
Blood counts are generally an auxiliary diagnostic item, usually combined with the presence of paroxysmal, spasmodic cough, chicken-like inspiratory sounds, low-grade fever, and other similar clinical symptoms in the surrounding people, as well as through the blood counts can be made a clinical diagnosis.
Nasopharyngeal swabs are used to collect respiratory secretions for culture, and the diagnosis can be confirmed if B. pertussis can be cultured; serologic testing for antibodies and testing of B. pertussis DNA in the patient’s nasopharyngeal secretions can also be performed to confirm the diagnosis.
When a patient has pertussis, he or she should be actively treated under the guidance of a physician.