The ectoparasite test detects the presence of rickettsial antibodies in the patient’s serum by performing a nonspecific agglutination reaction with OXl9, OX2, and OXK, which have common bacteriophage antigens with rickettsiae. After the human body is infected by rickettsiae, the serum gradually produces the corresponding antibodies, which appear 5 to 12 days after the onset of the disease and basically disappear after a few months, and the general agglutination value is above 1:160 or the potency rises significantly during the course of the disease has diagnostic significance. The common rickettsial diseases in China are typhus de typhus and tsutsugamushi, epidemic typhus mainly for OX19 agglutination price is elevated, tsutsugamushi mainly for OXK elevation is obvious. So, what does the test for a negative external Fever test mean? The following is a brief introduction: Proteus vulgaris agglutination test: also known as exo-Fei reaction. OX19 of Mycobacterium avium as antigen and patient serum for agglutination test, potency 1:160 or more for diagnostic reference, gradually increase with the course of the disease is more significant. Positive reaction can appear from 5 to 24 days of illness, and most of them can reach 1:320 or 1:640 or more in 2 to 3 weeks of illness. After a few weeks to 3 months, it may turn negative. A small number of patients never show a positive reaction. Patients with a negative Fever test should rest in bed, drink more water, eat a liquid or soft diet, pay attention to oral hygiene, and keep the skin clean. In patients with high fever, antipyretic and analgesic agents can be used. In severe cases, corticosteroids can be given to reduce the toxemia symptoms, and in patients with heart failure, absolute bed rest should be given, and heart failure should be controlled with cardiac drugs and diuretics.