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Malaria

Malaria. An Overview of Life-cycle, Morphology and Clinical Picture. Malaria Species. Four species of malaria : Plasmodium falciparum: malignant tertian malaria Plasmodium vivax: benign tertian malaria Plasmodium ovale : benign tertian malaria

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Malaria

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  1. Malaria An Overview of Life-cycle, Morphology and Clinical Picture

  2. Malaria Species • Four species of malaria : • Plasmodium falciparum: malignant tertian malaria • Plasmodium vivax: benign tertian malaria • Plasmodium ovale : benign tertian malaria • Plasmodium malariae: quartan malaria

  3. Oocyst Sporozoites Stomach Wall Zygote Salivary Gland Gametocytes Hypnozoites Erythrocytic Cycle LIFE CYCLE OF MALARIA sporozoites Pre-erythrocytic (hepatic) cycle Exo-erythrocytic (hepatic) cycle

  4. Components of the Malaria Life Cycle Sporogonic cycle Infective Period Mosquito bites uninfected person Mosquito Vector Parasites visible Human Host Mosquito bites gametocytemic person Prepatent Period Symptom onset Recovery Incubation Period Clinical Illness

  5. CLINICAL SIGNS & SYMPTOMS Hot stage Cold stage Sweating

  6. Plasmodium falciparum:: Plasmodium vivax, Plasmodium ovale Plasmodium malariae\:

  7. CLINICAL PICTURE Chronic Disease Acute Disease Infection During Pregnancy Non-severe Acute Febrile disease Chronic Asymptomatic Infection Placental Malaria Cerebral Malaria Anemia Low Birth weight Developmental Disorders; Transfusions; Death Increased Infant Mortality Death

  8. Definition • Severe malaria is defined as symptomatic malaria in a patient with P. falciparum asexual parasitaemia with one or more of the following complications: • Cerebral malaria (unrousable coma not attributable to other causes). • Generalised convulsions (> 2 episodes within 24 hours) • Severe normocytic anaemia (Ht<15% or Hb < 5 g/dl) • Hypoglycaemia (glood glucose < 2.2 mmol/l or 40 mg/dl ) • Metabolic acidosis with respiratory distress (arterial pH < 7.35 or bicarbonate < 15 mmol/l) • Fluid and electrolyte disturbances • Acute renal failure (urine <400 ml/24 h in adults; 12 ml/kg/24 h in children) • Acute pulmonary oedema and adult respiratory distress syndrome • Abnormal bleeding • Jaundice • Haemoglobinuria • Circulatory collapse, shock, septicaema (algid malaria) • Hyperparasitaemia (>10% in non-immune; >20% in semi-immune)

  9. Definition • Uncomplicated malaria is defined as: Symptomatic infection with malaria parasitemia without signs of severity and/or evidence of vital organ dysfunction.

  10. Complications of malaria : Cerebral malaria

  11. Complications of malaria : Pulmonary oedema

  12. Complications of malaria : anaemia Child with severe malaria anaemia and no other malaria complication

  13. Child with severe malaria anaemia in conjunction with acidosis and respiratory distress

  14. Malarial haemoglobinuria Clinical Picture : Patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency may develop intravascular haemolysis and haemoglobinuria precipitated by primaquine and other oxidant drugs, even in the absence of malaria. Haemoglobinuria associated with malaria (“blackwater fever”) is uncommon and malarial haemoglobinuria usually presents in adults as severe disease with anaemia and renal failure.

  15. Common methods for parasitological diagnosis of malaria The two methods common in use : 1: Light microscopy 2: Rapid diagnostic tests (RDTs).

  16. Microscopy is the gold standard for diagnosis of malaria • Parasite density • Species diagnosis • Monitoring response to treatment

  17. Laboratory diagnosis of malaria

  18. Multiple infection Double chromatin CCMOVBD Marginal form Plasmodium falciparum (trophozoite stage) Diagnostic Points: • Small, regular, fine to fleshy cytoplasm • Infected RBCs not enlarged • Numerous, multiple infection is common • Ring, comma, marginal or accole forms are seen; often have double chromatin dots • Maurer’s dots not clearly visible

  19. Laboratory diagnosis of malaria Rapid diagnostic tests detect malaria antigens

  20. ACTION OF ANTIMALARIAL DRUG IN THE DIFFERENT LIFE STAGES OF THE MALARIA PARASITE • Sporontocides • Primaquine • Pyrimethamine • Proguanil • Tissue Schizontocides • Primaquine • Pyrimethamine • Tetracycline • Proguanil Gametocyide Primaquine • Anti-relapse (P.vivax) • primaquine Wellcome Trust (Modified) • Blood Schizontocides • Chloroquine • Sulfadoxine/Pyrimethamine • Quinine • Quinidine • Artemisinins

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