| Clinical grading system | Description of zombification [22] |
| First, “oral numbness and paraesthesia, sometimes accompanied by gastrointestinal symptoms (nausea)” | Digestive disorders with vomiting. |
| Second, “numbness of face and other areas, advanced paraesthesia, motor paralysis of extremities, incoordination, slurred speech, but still normal reflexes.” | — |
| Third, “gross muscular incoordination, aphonia, dysphagia, dyspnoea, cyanosis, drop in blood pressure, fixed/dilated pupils, precordial pain, but victims are still conscious.” | — |
| Fourth, “severe respiratory failure and hypoxia, severe hypotension, bradycardia, cardiac arrhythmia, heart continuing to pulsate for a short period.” | Pronounced breathing difficulties, pulmonary edema, hypertension, hypothermia, renal failure, and rapid weight loss. |
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