Transmission of microfilaria in mosquito is ?
Correct Answer: Cyclo-developmental
Description: Ans. is 'a' i.e., Cyclodevelopmental In vector born diseases, an ahropod or any living carrier (e.g., snail) acts as a vector and transpos an infectious agent to a susceptible individual. Transmission by a vector may be of following types : ? A. Mechanical transmission The infectious agent is mechanically transpoed by vector, e.g., through souling of feet of flying ahropod. There is no development or multiplication of infectious agent within the vector. B. Biological transmission The infectious agent undergoes replication (change in number) or development (change in form) or both in vector. So, inectious agent requires an incubation period (extrinsic incubation period) before vector can transmit it to host. This type of transmission is of three types : - i) Propagative Agent undergoes multiplication (change in number) in the vector. There is no development - No change in form. Example - Plague bacilli in rate fleas. ii) Cyclo-developmental Agent undergoes only development - Change in form. No multiplication - No change in number. Example - Micorfilaria in mosquito. iii) Cyclo-propagative Agent undergoes both development and multiplication - Change in form and number. Example - Malaria parasite (plasmodium sp.) in mosquito.
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