| No envenomation | Absence of local or systemic reactions; fang marks (±) |
| Mild envenomation | Fang marks (+), moderate pain, minimal local edema, erythema (+), ecchymosis (±), and no systemic reactions (hemoglobin, platelets, prothrombin time, and fibrinogen are normal) | Moderate envenomation | Fang marks (+), severe pain, moderate local edema erythema and ecchymosis (+), systemic weakness, sweating, syncope, nausea, vomiting, anemia, or thrombocytopenia | Severe envenomation | Fang marks (+), severe pain, severe local edema, erythema and ecchymosis (+), hypotension, paresthesia, coma, pulmonary edema, and respiratory failure |
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