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Definition of severe malaria[1,2]

Definition of severe malaria[1,2]
Manifestations Definitions
Impaired consciousness Glasgow coma score <11 in adults or Blantyre coma score <3 in children; inability to swallow
Prostration Generalized weakness so that a person is unable to sit, stand, or walk without assistance
Multiple convulsions More than two episodes within 24 hours
Acidosis A base deficit of >8 mEq/L, a plasma bicarbonate level of <15 mmol/L, or venous plasma lactate ≥5 mmol/L. Clinical indicators of acidosis include rapid, deep, labored breathing.
Hypoglycemia Blood or plasma glucose <40 mg/dL (<2.2 mmol/L) for children ≥5 years and adults; blood or plasma glucose <54 mg/dL (<3 mmol/L) for children <5 years
Severe anemia Hemoglobin concentration ≤5 g/dL or hematocrit ≤15% in children <12 years of age (<7 g/dL and <20%, respectively, in adults) with parasite count >10,000 parasites/uL
Renal impairment Plasma or serum creatinine >3 mg/dL (265 umol/L) or blood urea >20 mmol/L
Jaundice Plasma or serum bilirubin >50 umol/L (3 mg/dL) with one of the following:
  • Plasmodium falciparum parasite count >2.5% parasitemia
  • Plasmodium knowlesi parasite count >20,000 parasites/uL
Pulmonary edema Radiographically confirmed or oxygen saturation <92% on room air with respiratory rate >30/minute, often with chest indrawing and crepitations on auscultation
Significant bleeding Including recurrent or prolonged bleeding (from the nose, gums, or venipuncture sites), hematemesis, or melena
Shock Compensated shock is defined as capillary refill ≥3 seconds or temperature gradient on leg (mid to proximal limb), but no hypotension. Decompensated shock is defined as systolic blood pressure <70 mmHg in children or <80 mmHg in adults, with evidence of impaired perfusion (cool peripheries or prolonged capillary refill).
Hyperparasitemia P. falciparum:
  • In non-immune travelers: parasitemia ≥5%[3]
  • All patients: parasitemia >10%
P. knowlesi:
  • Parasite density >100,000 parasites/uL
Plasmodium vivax:
  • No established parasite density thresholds
Severe malaria is defined as one or more of the above criteria, occurring in the presence of malaria infection and in the absence of an identified alternative cause.
Data from:
  1. World Health Organization. Guidelines for malaria. WHO: Geneva 2022. Available at: https://apps.who.int/iris/handle/10665/351995 (Accessed on April 11, 2022).
  2. Severe malaria. Trop Med Int Health 2014; Suppl 1:7.
  3. https://www.cdc.gov/malaria/about/disease.html.
Graphic 107439 Version 9.0

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