Bachelor’s Degree Programme(BSCG)– INSECT VECTORS AND VECTOR BORNE DISEASES Answer | BZYET-143(Q-8)

Bachelor’s Degree Programme(BSCG)– INSECT VECTORS AND VECTOR BORNE DISEASES Answer | BZYET-143(Q-8)

8. i) Give differences between the following:
a) Extrinsic incubation period and intrinsic incubation period
b) Transverse and vertical transmission
c) Urban cycle and sylvatic cycle
ii) Draw labeled diagrams of the following:
a) Life cycle of Aedes mosquito
b) Dengue transmission Cycle

Answer:

i)
(a) The terms “intrinsic incubation period” and “extrinsic incubation period” are used in vector-borne diseases. The intrinsic incubation period is the time taken by an organism to complete its development in the definitive host. The extrinsic incubation period is the time taken by an organism to develop in the intermediate host.
– For example, once ingested by a mosquito, malaria parasites must undergo development within the mosquito before they are infectious to humans. The time required for development in the mosquito ranges from 10 to 28 days, depending on the parasite species and the temperature. This is the extrinsic incubation period of that parasite. If a female mosquito does not survive longer than the extrinsic incubation period, then she will not be able to transmit any malaria parasites.
– But if a mosquito successfully transfers the parasite to a human body via a bite, the parasite starts developing. The time between the injection of the parasite into the human and the development of the first symptoms of malaria is its intrinsic incubation period.

(c) Sylvatic Cycle – Sylvatic refers to the occurrence of a subject in or affecting wild animals. The sylvatic cycle is the fraction of the pathogen population’s lifespan spent cycling between wild animals and vectors. Humans are usually incidental or dead-end hosts, infected by a vector.

Urban Cycle – Urban ecology promotes resilient and sustainable urban spaces where humans and nature coexist. When integrated in the right way, it can help in decreasing air and water pollution while enabling new ways of food production, transportation, and housing for people as well.

ii)

a) Life cycle of Aedes mosquito

b) Dengue transmission Cycle

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Ignou Assignment Solutions Edited question April 24, 2022
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