The diagnosis of hemorrhagic fever can only be confirmed by combining epidemiological history, symptoms, signs, and laboratory test results. Among them, laboratory results play a key role, serology and viral nucleic acid testing is the gold standard to confirm the diagnosis, the so-called epidemiological history, that is, in daily life can come into contact with rats, such as eating food contaminated by rats, or even bitten by rats. The typical symptoms of hemorrhagic fever can be summarized as three red and three pains, three pains, namely headache, orbital pain and lumbago, three rednesses, namely flushing and bleeding of the skin of the face, neck and upper chest, 2. Subcutaneous bleeding, oliguria or even anuria can also be seen in the clinic. 3. The test results are positive for antibodies to hemorrhagic fever, positive for nucleic acid or isolation of hantavirus in the serum.