Class 8 Biology Microorganisms: Friend and Foe Malaria

Diseases in Humans: Malaria

  • Pathogen
    • Protozoa, Plasmodium

                (P. vivax, P. falciparum, P. malaria)


  • Pathogen’s entry
    • Through bite of female Anopheles mosquito
    • Female Anopheles mosquito acts as Transmitting agent
    • RBCs are ruptured



  • Symptoms
    • High fever
    • Chills
    • Headache
    • Bodyache
    • Nausea
    • Vomiting


  • Treatment
    • Diagnosed using Blood tests & Liver Function tests
    • Treated with anti-malarial drugs


Lifecycle of Malarial parasite


Plasmodium parasite has 2 hosts. This parasite spends half of its lifecycle inside human beings & the remaining half inside mosquitoes. Thus, Humans & mosquitoes are two hosts of Plasmodium parasite.

  1. Mosquito bites an infected person
  2. Takes up gametocytes
  3. Development of gametocytes occurs in mosquito
  4. Sporozoites are formed & stored in salivary glands of mosquitoes
  5. The same mosquito then bites a normal person
  6. Injects the sporozoites
  7. Development of the sporozoites occur in liver cells inside the body of that person
  8. RBCs rupture, the person thus suffers from malaria
  9. Gametocytes are formed, which get picked up by mosquitoes when they bite this person again.



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