Petechiae on the conjunctiva are one of the clinical manifestations of sepsis. The clinical onset of sepsis is rapid, and the rash is in the form of petechiae, urticaria, impetigo, and scarlet fever-like rash with petechiae on the conjunctiva. Gram-negative cocci sepsis causes petechiae on the conjunctiva. Examination items of petechiae on the conjunctiva: 1. Blood test The total number of leukocytes is mostly significantly increased, up to 10~30×109/L, and the percentage of neutrophils is increased, more than 80%, and there may be obvious left shift of the nucleus and intracellular toxic granules. A few gram-negative sepsis and immunocompromised patients may have normal or slightly reduced leukocyte count. Blood culture, cerebrospinal fluid culture, urine culture and other secretion culture. Due to the low resistance of the patient and the culture technique, the negative result of culture cannot exclude sepsis. (1) Blood leukocytes and neutrophils are obviously increased, often with obvious left shift of nuclear lobes and poisoning particles in leukocytes, and acidic granulocytes are reduced or disappeared. The total number of leukocytes may be normal or reduced in the old and weak or low body reaction as well as in some Gram-negative bacterial infections. (2) Positive blood and bone marrow cultures. If with local lesion secretion (pus, urine, pleural fluid, cerebrospinal fluid, etc.) culture obtained bacteria consistent. The diagnosis can be confirmed. 4.Neutrophil tetrazolium blue (NBT) test This test is positive only in bacterial infection, which can be as high as 20% or more (normal below 8%), which can help to identify viral infections and non-infectious diseases from bacterial infections.