After parasitic infection, blood tests mainly show elevated white blood cells and eosinophils, and there may be localized symptoms at the site of infection, such as fever and pain. When the human body is infected with parasites, the parasites cause inflammation in the body, which is reflected in the elevation of white blood cells and eosinophils in the routine blood test. In the vast majority of parasites, eosinophils are significantly elevated in the blood count. If the parasite is localized to a secondary bacterial infection, it may also result in elevated neutrophils. Localized infection or parasitic site, there may be corresponding symptoms, such as intestinal parasites, may appear abdominal pain, diarrhea; lung parasites can cause fever, cough, and so on. Blood test alone cannot confirm the diagnosis of parasitic infection, but should also improve the feces to look for parasite eggs, parasite antibodies and other tests. If the corresponding parasites are found in the feces or the corresponding parasite antibodies are detected in the blood, the parasitic infection can be confirmed, and after the diagnosis is confirmed, medication should be taken under the guidance of specialists.