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Question
How does the transmission of the following diseases take place?
Malaria
Solution
Mode of transmission :
The malaria parasite life cycle involves two hosts.
Plasmodium is transmitted from one person to another through an insect vector female Anopheles mosquito.
When an infected female Anopheles sucks the human blood, it may transfer sporozoites to human circulation. Sporozoites reproduce asexually through fission (schizogony) in the liver cells or erythrocytes.
The cells formed are now called merozoites. The cells formed within erythrocytes function as gametocytes (gamogony). Besides, it forms gametocytes within erythrocytes (gamogony). Gametocytes if taken up by female Anopheles, fertilization occurs in its gut.
A diploid zygote is formed which transforms into an oocyst.
Oocyst forms a large number of haploid sporozoites through meiosis (sporogony).
Sporozoites migrate to salivary glands and are ready to infect the new human hosts.
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