Question

Where will you look for sporozoites of malarial parasite?

• A. Spleen of infected human
• B. Saliva of infected female Anopheles
  
• C. Salivary glands of freshly moulted female Anopheles
  
• D. RBCs of persons suffering from malaria

Answer 1

Answer: (B)

Saliva of infected female Anopheles

• The mature infective stages of malarial parasite which are transferred from mosquito to man are sporozoites. The nucleus of oocyst divides first by meiosis and subsequently by mitosis, forming a large number of small haploid nuclei.
• At the same time, the cytoplasm develops large vacuoles. The tiny nuclei and cytoplasmic masses form elongated and spindle-shaped bodies called sporozoites.
• Each oocyst produces about 1,000 sporozoites. When mature oocysts rupture, the sporozoites are liberated into the haemocoel of the mosquito.
• Being motile, the sporozoites move to different organs in the body cavity of the mosquito, but many of them penetrate the salivary glands of the mosquito.
• So, sporozoites are found in the saliva of infected female Anopheles mosquito. When the female Anopheles mosquito bites a healthy person, the sporozoites are injected into his/her blood along with saliva.
• These sporozoites start the cycle again in the human body.